build: Fix CMake Xlib DisplayServer name.
build: Fix CMake Xlib DisplayServer name.

Change-Id: Ia50157cd4f245971208a1baa28c823a62683dcd3

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