WinRT: pseudo-implemented SDLmain for WinRT. It has to be compiled di…

…rectly into apps, for now.

src/main/windowsrt/SDL_winrt_main.cpp

@@ -0,0 +1,14 @@
+
+//#include "pch.h"
+
+// The app's C-style main will be passed into SDL.dll as a function
+// pointer, and called at the appropriate time.
+typedef int (*SDLmain_MainFunction)(int, char **);
+extern __declspec(dllimport) int SDL_WinRT_RunApplication(SDLmain_MainFunction mainFunction);
+extern "C" int SDL_main(int, char **);
+
+[Platform::MTAThread]
+int main(Platform::Array<Platform::String^>^)
+{
+    return SDL_WinRT_RunApplication(SDL_main);
+}