API BREAKER: Replacing defines in irrTypes.h which are conflicting with c++ reserved identifier rules.

C++ has undefined behavior for identifiers starting with __ or with _ followed by an uppercase letter.
We still have many more (in IrrCompileConfig.h and in all header-guards), will likely replace those later as well.
As a workaround for users which might use irrlicht defines in their code, I've added the header irrLegacyDefines.h
Including that allows to continue using old defines for a while - or make it easier to have code which compiles 
with old and new Irrlicht library versions.


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@6251 dfc29bdd-3216-0410-991c-e03cc46cb475

include/irrLegacyDefines.h

@@ -0,0 +1,24 @@
+// This file is part of the "Irrlicht Engine".
+// For conditions of distribution and use, see copyright notice in irrlicht.h
+
+#ifndef IRR_LEGACY_DEFINES_H_INCLUDED
+#define IRR_LEGACY_DEFINES_H_INCLUDED
+
+//! Include this file _after_ irrlicht.h
+//! It contains old defines which got replaced in Irrlicht.
+//! So including this header is a quick fix to allow users compiling old code 
+//! without having to rewrite it all. Thought in the long run you should 
+//! switch to the new defines as well.
+
+// Defines replaced in Irrlicht 1.9 as they were reserved identifiers in c++
+#define _IRR_DEPRECATED_ IRR_DEPRECATED
+#define _IRR_OVERRIDE_ IRR_OVERRIDE
+#define _IRR_DEBUG_BREAK_IF IRR_DEBUG_BREAK_IF
+#define _IRR_TEXT IRR_TEXT
+
+// Defines which changed in Irrlicht 1.9 as they were reserved identifiers in c++,
+// but can't be set here as there are only checks _if_ they are defined.
+// If you have any of those in your code, you will have to change them there.
+// _IRR_DONT_DO_MEMORY_DEBUGGING_HERE -> IRR_DONT_DO_MEMORY_DEBUGGING_HERE
+
+#endif