updated to latest SDL2 (f9244b2a151)

jni/SDL2-2.0.3/include/SDL_main.h

@@ -67,6 +67,15 @@
  */
 #define SDL_MAIN_NEEDED
 
+#elif defined(__NACL__)
+/* On NACL we use ppapi_simple to set up the application helper code,
+   then wait for the first PSE_INSTANCE_DIDCHANGEVIEW event before 
+   starting the user main function.
+   All user code is run in a separate thread by ppapi_simple, thus 
+   allowing for blocking io to take place via nacl_io
+*/
+#define SDL_MAIN_NEEDED
+
 #endif
 #endif /* SDL_MAIN_HANDLED */