Mute some warnings

libraries/glslang/glslang/Include/Common.h

@@ -99,6 +99,7 @@ std::string to_string(const T& val) {
 #endif
 
 #if defined(_MSC_VER)
+#undef strdup
 #define strdup _strdup
 #endif
 

libraries/glslang/glslang/MachineIndependent/Constant.cpp

@@ -42,6 +42,10 @@
 #include <cstdlib>
 #include <climits>
 
+#ifdef _MSC_VER
+#pragma warning(disable: 4146) // warning C4146: unary minus operator applied to unsigned type, result still unsigned
+#endif
+
 namespace {
 
 using namespace glslang;