This problem was solved by qemu [1], so this mesa bug can be closed.
[1]
https://git.qemu.org/git/qemu.git/?a=commitdiff;h=9a1565a03b79d80b236bc7cc2dbce52a2ef3a1b8
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(In reply to Daniel P. Berrange from comment #3)
> (In reply to Ahzo from comment #2)
> > To check for the availability of the syscall, one can try it in a child
> > process and see if the child is terminated by a signal, e.g. like this:
>
> Afraid not, QEMU's seccomp
