Remove SDL_gtk

Author: eafton

src/SDL.c

@@ -30,10 +30,6 @@
 // this checks for HAVE_DBUS_DBUS_H internally.
 #include "core/linux/SDL_dbus.h"
 
-#if defined(SDL_PLATFORM_UNIX) && !defined(SDL_PLATFORM_ANDROID)
-#include "core/unix/SDL_gtk.h"
-#endif
-
 #ifdef SDL_PLATFORM_EMSCRIPTEN
 #include <emscripten.h>
 #endif
@@ -714,10 +710,6 @@ void SDL_Quit(void)
     SDL_DBus_Quit();
 #endif
 
-#if defined(SDL_PLATFORM_UNIX) && !defined(SDL_PLATFORM_ANDROID) && !defined(SDL_PLATFORM_EMSCRIPTEN) && !defined(SDL_PLATFORM_PRIVATE)
-    SDL_Gtk_Quit();
-#endif
-
     SDL_QuitTimers();
     SDL_QuitAsyncIO();