cmake: fix uses of undefined macro identifiers (-Wundef)

test/testgles2.c

@@ -65,11 +65,11 @@ static GLES2_Context ctx;
 
 static int LoadContext(GLES2_Context *data)
 {
-#if SDL_VIDEO_DRIVER_UIKIT
+#ifdef SDL_VIDEO_DRIVER_UIKIT
 #define __SDL_NOGETPROCADDR__
-#elif SDL_VIDEO_DRIVER_ANDROID
+#elif defined(SDL_VIDEO_DRIVER_ANDROID)
 #define __SDL_NOGETPROCADDR__
-#elif SDL_VIDEO_DRIVER_PANDORA
+#elif defined(SDL_VIDEO_DRIVER_PANDORA)
 #define __SDL_NOGETPROCADDR__
 #endif
 
@@ -893,9 +893,9 @@ int main(int argc, char *argv[])
         SDL_Log("%2.2f frames per second\n",
                 ((double)frames * 1000) / (now - then));
     }
-#if !defined(__ANDROID__) && !defined(__NACL__)  
+#if !defined(__ANDROID__) && !defined(__NACL__)
     quit(0);
-#endif    
+#endif
     return 0;
 }