Add simple include files for easy alignment packing of data structures

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4195 dfc29bdd-3216-0410-991c-e03cc46cb475

include/irrpack.h

+// Copyright (C) 2007-2011 Nikolaus Gebhardt
+// This file is part of the "Irrlicht Engine".
+// For conditions of distribution and use, see copyright notice in irrlicht.h
+
+// byte-align structures
+#if defined(_MSC_VER) || defined(__BORLANDC__) || defined (__BCPLUSPLUS__)
+#	pragma pack( push, packing )
+#	pragma pack( 1 )
+#	define PACK_STRUCT
+#elif defined( __GNUC__ )
+#	define PACK_STRUCT	__attribute__((packed))
+#else
+#	error compiler not supported
+#endif
+

include/irrunpack.h

+// Copyright (C) 2007-2011 Nikolaus Gebhardt
+// This file is part of the "Irrlicht Engine".
+// For conditions of distribution and use, see copyright notice in irrlicht.h
+
+// Default alignment
+#if defined(_MSC_VER) || defined(__BORLANDC__) || defined (__BCPLUSPLUS__)
+#	pragma pack( pop, packing )
+#endif
+
+#undef PACK_STRUCT
+