pandora: Fixed compile error.

src/video/pandora/SDL_pandora.h

@@ -92,7 +92,7 @@ SDL_GLContext PND_gl_createcontext(_THIS, SDL_Window * window);
 int PND_gl_makecurrent(_THIS, SDL_Window * window, SDL_GLContext context);
 int PND_gl_setswapinterval(_THIS, int interval);
 int PND_gl_getswapinterval(_THIS);
-void PND_gl_swapwindow(_THIS, SDL_Window * window);
+int PND_gl_swapwindow(_THIS, SDL_Window * window);
 void PND_gl_deletecontext(_THIS, SDL_GLContext context);