Switched the SDL 1.2 compatibility to use the window surface, so it's fast...

Switched the SDL 1.2 compatibility to use the window surface, so it's fast even when there's no hardware acceleration available.
This means that the YUV overlay now uses software, but that's okay since fast YUV code should be using the textures now anyway.

include/SDL_compat.h

@@ -273,8 +273,8 @@ struct SDL_SysWMinfo;
 #define SDL_AllocSurface    SDL_CreateRGBSurface
 
 extern DECLSPEC const SDL_version *SDLCALL SDL_Linked_Version(void);
-extern DECLSPEC char *SDLCALL SDL_AudioDriverName(char *namebuf, int maxlen);
-extern DECLSPEC char *SDLCALL SDL_VideoDriverName(char *namebuf, int maxlen);
+extern DECLSPEC const char *SDLCALL SDL_AudioDriverName(char *namebuf, int maxlen);
+extern DECLSPEC const char *SDLCALL SDL_VideoDriverName(char *namebuf, int maxlen);
 extern DECLSPEC const SDL_VideoInfo *SDLCALL SDL_GetVideoInfo(void);
 extern DECLSPEC int SDLCALL SDL_VideoModeOK(int width,
                                             int height,

src/video/SDL_video.c

@@ -1391,6 +1391,9 @@ SDL_GetWindowSurface(SDL_Window * window)
 
     if (!window->surface) {
         window->surface = SDL_CreateWindowFramebuffer(window);
+        if (window->surface) {
+            window->surface->refcount = 0x7FFFFFF;
+        }
     }
     return window->surface;
 }
@@ -1472,6 +1475,7 @@ void
 SDL_OnWindowResized(SDL_Window * window)
 {
     if (window->surface) {
+        window->surface->refcount = 0;
         SDL_FreeSurface(window->surface);
         window->surface = NULL;
     }
@@ -1552,6 +1556,10 @@ SDL_DestroyWindow(SDL_Window * window)
     /* Restore video mode, etc. */
     SDL_UpdateFullscreenMode(window, SDL_FALSE);
 
+    if (window->surface) {
+        window->surface->refcount = 0;
+        SDL_FreeSurface(window->surface);
+    }
     if (_this->DestroyWindowFramebuffer) {
         _this->DestroyWindowFramebuffer(_this, window);
     }