loader: gl167 - Remove unknown inst extensions
loader: gl167 - Remove unknown inst extensions

Change-Id: I24aecbdab452a04514fd42a9a9ae7f3bcf1cd2ca

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools