It's redundant at this point. The one exception is for GLX_PUBLIC when
building for glvnd, because then we really do want the GLX API to be
hidden.
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Acked-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33623>
It's better to test for needed functions instead of using external
knowledge about presence in this or that C library.
Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>