removed NaCL support.

include/SDL_platform.h

@@ -201,22 +201,6 @@
 #define __PS2__ 1
 #endif
 
-/* The NACL compiler defines __native_client__ and __pnacl__
- * Ref: http://www.chromium.org/nativeclient/pnacl/stability-of-the-pnacl-bitcode-abi
- */
-#if defined(__native_client__)
-#undef __LINUX__
-#undef __NACL__
-#define __NACL__ 1
-#endif
-#if defined(__pnacl__)
-#undef __LINUX__
-#undef __PNACL__
-#define __PNACL__ 1
-/* PNACL with newlib supports static linking only */
-#define __SDL_NOGETPROCADDR__
-#endif
-
 #if defined(__vita__)
 #define __VITA__ 1
 #endif