The old Nouveau GL driver has no support for GPUs after Ada. Instead,
users will always get NVK+Zink on Hopper+. Right now, if the user sets
NOUVEAU_USE_ZINK=false, the loader will return "nouveau" and EGL/GLX
will try to load that, fail, and then fall back to Zink. With this
patch, we instead print a warning message and then load Zink anyway.
Backport-to: 25.2
Reviewed-by: Mel Henning <mhenning@darkrefraction.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36329>
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