dynapi: Fixed build on non-Android platforms.

src/dynapi/SDL_dynapi_procs.h

@@ -804,4 +804,6 @@ SDL_DYNAPI_PROC(void,SDL_OnApplicationDidBecomeActive,(void),(),)
 #ifdef __IPHONEOS__
 SDL_DYNAPI_PROC(void,SDL_OnApplicationDidChangeStatusBarOrientation,(void),(),)
 #endif
+#ifdef __ANDROID__
 SDL_DYNAPI_PROC(int,SDL_GetAndroidSDKVersion,(void),(),return)
+#endif