Use C++11 mutexes only (remove compat code) (#5922)

* Fix event LINT & remove default constructor/destructors
* remove compat code & modernize autolock header

src/script/cpp_api/s_async.h

@@ -25,7 +25,6 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <map>
 
 #include "threading/thread.h"
-#include "threading/mutex.h"
 #include "threading/semaphore.h"
 #include "debug.h"
 #include "lua.h"
@@ -147,13 +146,13 @@ private:
 	unsigned int jobIdCounter;
 
 	// Mutex to protect job queue
-	Mutex jobQueueMutex;
+	std::mutex jobQueueMutex;
 
 	// Job queue
 	std::deque<LuaJobInfo> jobQueue;
 
 	// Mutex to protect result queue
-	Mutex resultQueueMutex;
+	std::mutex resultQueueMutex;
 	// Result queue
 	std::deque<LuaJobInfo> resultQueue;
 

src/script/cpp_api/s_base.h

@@ -29,7 +29,6 @@ extern "C" {
 
 #include "irrlichttypes.h"
 #include "threads.h"
-#include "threading/mutex.h"
 #include "threading/mutex_auto_lock.h"
 #include "common/c_types.h"
 #include "common/c_internal.h"
@@ -116,7 +115,7 @@ protected:
 
 	void objectrefGetOrCreate(lua_State *L, ServerActiveObject *cobj);
 
-	RecursiveMutex  m_luastackmutex;
+	std::recursive_mutex m_luastackmutex;
 	std::string     m_last_run_mod;
 	bool            m_secure;
 #ifdef SCRIPTAPI_LOCK_DEBUG