Update DYNAPI SDL_WinRTRunApp() prototype which was wrong (see #6783)

src/dynapi/SDL_dynapi_procs.h

@@ -607,7 +607,7 @@ SDL_DYNAPI_PROC(SDL_bool,SDL_DXGIGetOutputInfo,(int a,int *b, int *c),(a,b,c),re
 #endif
 SDL_DYNAPI_PROC(SDL_bool,SDL_RenderIsClipEnabled,(SDL_Renderer *a),(a),return)
 #ifdef __WINRT__
-SDL_DYNAPI_PROC(int,SDL_WinRTRunApp,(int a, char **b, void *c),(a,b,c),return)
+SDL_DYNAPI_PROC(int,SDL_WinRTRunApp,(SDL_main_func a, void *b),(a,b),return)
 SDL_DYNAPI_PROC(const wchar_t*,SDL_WinRTGetFSPathUNICODE,(SDL_WinRT_Path a),(a),return)
 SDL_DYNAPI_PROC(const char*,SDL_WinRTGetFSPathUTF8,(SDL_WinRT_Path a),(a),return)
 #endif