update SDL soruce to 2.0.14

Edward Rudd

2021-06-15 dec7875a6e23212021e4d9080330a42832dfe02a

 source/src/video/winrt/SDL_winrtpointerinput.cpp

@@ -26,7 +26,6 @@
#include "SDL_winrtevents_c.h"
#include "SDL_winrtmouse_c.h"
#include "SDL_winrtvideo_cpp.h"
#include "SDL_assert.h"
#include "SDL_system.h"

extern "C" {