Backport of "meson: fix check for pthread_setname_np()" into 1.20
requested to merge tpm/gstreamer:backport-mr-3538-into-1.20-meson-fix-pthread_setname_np-check into 1.20
Backport of !3538 (merged) "meson: fix check for pthread_setname_np()".
Commits:
- a2c7398a meson: fix check for pthread_setname_np()