It pulls in a lot of stuff via the libglx0 -> libglx-mesa0 dependency
chain, so only suggest it for now to avoid installing it in the
installer or via common "PVE on-top Debian" installations, VirGL
integration is experimental after all and we may drop/replace it with
the vulkan based venus one, once available (Debian 12?).
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>