N3DS port (squashed)

A dedicated renderer using Citro3D would likely allow for better
much better graphical performances.

include/SDL_stdinc.h

@@ -410,7 +410,7 @@ SDL_COMPILE_TIME_ASSERT(sint64, sizeof(Sint64) == 8);
 
 /** \cond */
 #ifndef DOXYGEN_SHOULD_IGNORE_THIS
-#if !defined(__ANDROID__) && !defined(__VITA__)
+#if !defined(__ANDROID__) && !defined(__VITA__) && !defined(__3DS__)
    /* TODO: include/SDL_stdinc.h:174: error: size of array 'SDL_dummy_enum' is negative */
 typedef enum
 {