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	Fix & make linux conditionals uniform (#4278)
The source used a hodge-podge of different combinations of different macros to check for linux: 'linux', '__linux', '__linux__'. As '__linux__' is standard (Posix), and the others are not, the source now uniformly uses __linux__. If either linux or __linux are defined, it is made sure that __linux__ is defined as well.
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		@@ -630,7 +630,7 @@ bool GUIChatConsole::OnEvent(const SEvent& event)
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		}
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		else if(event.KeyInput.Char != 0 && !event.KeyInput.Control)
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		{
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			#if (defined(linux) || defined(__linux))
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			#if (defined(__linux__))
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				wchar_t wc = L'_';
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				mbtowc( &wc, (char *) &event.KeyInput.Char, sizeof(event.KeyInput.Char) );
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				prompt.input(wc);
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@@ -271,7 +271,7 @@ bool intlGUIEditBox::OnEvent(const SEvent& event)
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			break;
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		case EET_KEY_INPUT_EVENT:
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        {
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#if (defined(linux) || defined(__linux) || defined(__FreeBSD__))
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#if (defined(__linux__) || defined(__FreeBSD__))
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            // ################################################################
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			// ValkaTR:
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            // This part is the difference from the original intlGUIEditBox
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@@ -258,7 +258,7 @@ bool getCurrentExecPath(char *buf, size_t len)
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//// Linux
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#elif defined(linux) || defined(__linux) || defined(__linux__)
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#elif defined(__linux__)
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bool getCurrentExecPath(char *buf, size_t len)
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{
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@@ -374,7 +374,7 @@ bool setSystemPaths()
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//// Linux
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#elif defined(linux) || defined(__linux)
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#elif defined(__linux__)
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bool setSystemPaths()
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{
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@@ -60,7 +60,11 @@ with this program; if not, write to the Free Software Foundation, Inc.,
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	#include <unistd.h>
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	#include <stdint.h> //for uintptr_t
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	#if (defined(linux) || defined(__linux) || defined(__GNU__)) && !defined(_GNU_SOURCE)
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	// Use standard Posix macro for Linux
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	#if (defined(linux) || defined(__linux)) && !defined(__linux__)
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		#define __linux__ 
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	#endif
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	#if (defined(__linux__) || defined(__GNU__)) && !defined(_GNU_SOURCE)
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		#define _GNU_SOURCE
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	#endif
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@@ -321,7 +325,7 @@ inline const char *getPlatformName()
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	return
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#if defined(ANDROID)
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	"Android"
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#elif defined(linux) || defined(__linux) || defined(__linux__)
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#elif defined(__linux__)
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	"Linux"
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#elif defined(_WIN32) || defined(_WIN64)
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	"Windows"
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@@ -54,7 +54,7 @@ DEALINGS IN THE SOFTWARE.
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// for setName
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#if defined(linux) || defined(__linux)
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#if defined(__linux__)
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	#include <sys/prctl.h>
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#elif defined(__FreeBSD__) || defined(__OpenBSD__)
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	#include <pthread_np.h>
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@@ -70,7 +70,7 @@ DEALINGS IN THE SOFTWARE.
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// for bindToProcessor
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#if __FreeBSD_version >= 702106
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	typedef cpuset_t cpu_set_t;
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#elif defined(__linux) || defined(linux)
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#elif defined(__linux__)
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	#include <sched.h>
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#elif defined(__sun) || defined(sun)
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	#include <sys/types.h>
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@@ -261,7 +261,7 @@ DWORD WINAPI Thread::threadProc(LPVOID param)
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void Thread::setName(const std::string &name)
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{
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#if defined(linux) || defined(__linux)
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#if defined(__linux__)
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	// It would be cleaner to do this with pthread_setname_np,
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	// which was added to glibc in version 2.12, but some major
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@@ -363,7 +363,7 @@ bool Thread::bindToProcessor(unsigned int proc_number)
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	return SetThreadAffinityMask(getThreadHandle(), 1 << proc_number);
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#elif __FreeBSD_version >= 702106 || defined(__linux) || defined(linux)
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#elif __FreeBSD_version >= 702106 || defined(__linux__)
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	cpu_set_t cpuset;
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