Fixed issue #322.

tools/shaderc/shaderc_dx11.cpp

@@ -14,7 +14,10 @@
 #	define D3D_SVF_USED 2
 #endif // D3D_SVF_USED
 
+#ifndef IID_ID3D11ShaderReflection
 static const GUID GUID_ID3D11ShaderReflection = { 0x0a233719, 0x3960, 0x4578, { 0x9d, 0x7c, 0x20, 0x3b, 0x8b, 0x1d, 0x9c, 0xc1 } };
+#	define IID_ID3D11ShaderReflection GUID_ID3D11ShaderReflection
+#endif // IID_ID3D11ShaderReflection
 
 struct RemapInputSemantic
 {
@@ -209,7 +212,7 @@ bool compileHLSLShaderDx11(bx::CommandLine& _cmdLine, const std::string& _code,
 	ID3D11ShaderReflection* reflect = NULL;
 	hr = D3DReflect(code->GetBufferPointer()
 		, code->GetBufferSize()
-		, GUID_ID3D11ShaderReflection
+		, IID_ID3D11ShaderReflection
 		, (void**)&reflect
 		);
 	if (FAILED(hr) )