configure.ac: add -pthread to PTHREAD_LIBS
As described inline - follow what's written in the manual and what works
for all platforms that Mesa supports.
We want to untangle things leaving only -pthread, yet that has a
potential of causing regressions. Thus we'll do it as a follow-up patch.
As a nice side-effect this resolves issues, where the system lacks
libpthread.so, yet the linker does not warn about it and we and up with
unresolved symbols.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101071
Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
(cherry picked from commit
e5aa806e5f01b842d1af4775f8e4c53282908304)
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