681c734804
New Vulkan CTS 1.4.4 started requiring glx.pc pkg-config file. Provide one if GLVND is not used in order to let VK CTS and other programs find Mesa GLX implementation. Cc: mesa-stable Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37834>