Add d3d11shader.h GUIDs

Adds:
IID_ID3D11ShaderReflectionType
IID_ID3D11ShaderReflectionVariable
IID_ID3D11ShaderReflectionConstantBuffer
IID_ID3D11ShaderReflection
diff --git a/mingw-w64-crt/libsrc/dxguid.c b/mingw-w64-crt/libsrc/dxguid.c
index 6302eec..81d9a2a 100644
--- a/mingw-w64-crt/libsrc/dxguid.c
+++ b/mingw-w64-crt/libsrc/dxguid.c
@@ -20,6 +20,7 @@
 #include <d3d9.h>
 #include <d3d10.h>
 #include <d3d11.h>
+#include <d3d11shader.h>
 
 DEFINE_GUID(CLSID_CDirect3DRM,0x4516ec41,0x8f20,0x11d0,0x9b,0x6d,0x0,0x0,0xc0,0x78,0x1b,0xc3);
 DEFINE_GUID(CLSID_CDirect3DRMAnimation,0x4fa35698,0x623f,0x11cf,0xac,0x4a,0x0,0x0,0xc0,0x38,0x25,0xa1);