Patched to compile with MingW64 on case-sensitive systems (thanks, Martin!). Fixes Bugzilla #2440.
diff --git a/src/video/windows/SDL_windowsvideo.c b/src/video/windows/SDL_windowsvideo.c
index 92ddcdf..503653b 100644
--- a/src/video/windows/SDL_windowsvideo.c
+++ b/src/video/windows/SDL_windowsvideo.c
@@ -247,7 +247,7 @@ SDL_Direct3D9GetAdapterIndex( int displayIndex )
#define CINTERFACE
#define COBJMACROS
-#include <DXGI.h>
+#include <dxgi.h>
SDL_bool
DXGI_LoadDLL( void **pDXGIDLL , IDXGIFactory **pDXGIFactory )