SDL

- add a new SDL_HINT_MAC_BACKGROUND_APP hint, when set or set to 1 don't force the app to be foreground

include/SDL_hints.h

@@ -525,6 +525,14 @@ extern "C" {
  */
 #define SDL_HINT_VIDEO_MAC_FULLSCREEN_SPACES    "SDL_VIDEO_MAC_FULLSCREEN_SPACES"
 
+/**
+*  \brief  When set don't force the SDL app to become a foreground process
+*
+*  This hint only applies to Mac OS X.
+*
+*/
+#define SDL_HINT_MAC_BACKGROUND_APP    "SDL_MAC_BACKGROUND_APP"
+    
 /**
  * \brief Android APK expansion main file version. Should be a string number like "1", "2" etc.
  */