message: GLSLangUtils: avoid redefinition of ENABLE_HLSL
diff: #if (defined(VK_USE_PLATFORM_IOS_MVK) || defined(VK_USE_PLATFORM_MACOS_MVK))
  # include <MoltenGLSLToSPIRVConverter/GLSLToSPIRVConverter.h>
  #else
  +# ifndef ENABLE_HLSL
  # define ENABLE_HLSL
  +# endif
  # include "SPIRV/GlslangToSpv.h"
  #endif
  