The NaCL mount/unmount functions need to be in SDL_system.h and specific to NaCL

src/file/SDL_rwops.c

@@ -766,28 +766,4 @@ SDL_WriteBE64(SDL_RWops * dst, Uint64 value)
     return SDL_RWwrite(dst, &swapped, sizeof (swapped), 1);
 }
 
-
-/* SDL_RWops on NACL are implemented using nacl_io, and require mount points
- * to be established before actual file operations are performed
- * 
- * Ref: https://developers.google.com/native-client/dev/devguide/coding/nacl_io?hl=es
- */
-
-int 
-SDL_RWMount(const char* source, const char* target, const char* filesystemtype, 
-          unsigned long mountflags, const void *data) {
-#if __NACL__
-    return mount(source, target, filesystemtype, mountflags, data);
-#endif /* __NACL__ */
-    return SDL_SetError ("Mount not supported on this platform");
-}
-
-int 
-SDL_RWUmount(const char *target) {
-#if __NACL__
-    return umount(target);
-#endif /* __NACL__ */
-    return SDL_SetError ("Umount not supported on this platform");
-}
-
 /* vi: set ts=4 sw=4 expandtab: */