Adjust to glslang's removal of NV_EXTENSIONS from headers
Adjust to glslang's removal of NV_EXTENSIONS from headers

antiagainst/shaderc,dneto0/shaderc,dneto0/shaderc,dneto0/shaderc,dneto0/shaderc,antiagainst/shaderc,antiagainst/shaderc,antiagainst/shaderc