Lots of fixes importing SDL source wholesale into a new iOS project

--HG--
rename : src/libm/math.h => src/libm/math_libm.h

include/SDL_opengl.h

@@ -30,6 +30,8 @@
 
 #include "SDL_config.h"
 
+#ifndef __IPHONEOS__
+
 #ifdef __WIN32__
 #define WIN32_LEAN_AND_MEAN
 #ifndef NOMINMAX
@@ -11123,6 +11125,8 @@ typedef void (APIENTRYP PFNGLVDPAUUNMAPSURFACESNVPROC) (GLsizei numSurface, cons
 /* *INDENT-ON* */
 #endif /* NO_SDL_GLEXT */
 
+#endif /* !__IPHONEOS__ */
+
 #endif /* _SDL_opengl_h */
 
 /* vi: set ts=4 sw=4 expandtab: */