update SDL soruce to 2.0.14

Edward Rudd

2021-06-15 dec7875a6e23212021e4d9080330a42832dfe02a

 source/src/video/winrt/SDL_winrtmouse.cpp

@@ -34,12 +34,10 @@
 * SDL includes:
 */
extern "C" {
#include "SDL_assert.h"
#include "../../events/SDL_mouse_c.h"
#include "../../events/SDL_touch_c.h"
#include "../SDL_sysvideo.h"
#include "SDL_events.h"
#include "SDL_log.h"
}

#include "../../core/winrt/SDL_winrtapp_direct3d.h"