layers: Add enable for NV_GLSL_SHADER extension
layers: Add enable for NV_GLSL_SHADER extension

Change-Id: Iffe21dd329c253878b9c2db0ceaf2e8f62679703

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers