Fixed Xcode warnings on macOS

src/SDL_log.c

@@ -486,7 +486,8 @@ SDL_LogOutput(void *userdata, int category, SDL_LogPriority priority,
         fclose (pFile);
     }
 #endif
-#if HAVE_STDIO_H
+#if HAVE_STDIO_H && \
+    !(defined(__APPLE__) && (defined(SDL_VIDEO_DRIVER_COCOA) || defined(SDL_VIDEO_DRIVER_UIKIT)))
     fprintf(stderr, "%s: %s\n", SDL_priority_prefixes[priority], message);
 #if __NACL__
     fflush(stderr);