(svn r3596) -Codechange: [OSX] changed to use Apple's macros instead of OTTD macros for endian conversion

This increases the execution speed a lot since GCC can't detect the OTTD macro as an endian conversion
	while Apple's code uses the instruction to convert endian instead of a series of instructions to produce the same result

	Since we don't have that many endian conversions in the game, overall performance should not increase noteworthy

os/macosx/osx_stdafx.h

@@ -0,0 +1,19 @@
+/* $Id$ */
+
+#ifndef MACOS_STDAFX_H
+#define MACOS_STDAFX_H
+
+#include <CoreServices/CoreServices.h>
+// remove the variables that CoreServices defines, but we define ourselves too
+#undef bool
+#undef false
+#undef true
+
+/* Name conflict */
+#define Rect		OTTDRect
+#define Point		OTTDPoint
+#define GetTime		OTTDGetTime
+
+#define SL_ERROR OSX_SL_ERROR
+
+#endif /* MACOS_STDAFX_H */