util/u_thread: include pthread_np.h if found

Required for pthread_set_name_np() on OpenBSD as there is no
pthread_setaffinity_np() to define PTHREAD_SETAFFINITY_IN_NP_HEADER.

Fixes: dcf9d91a80e ("util: Handle differences in pthread_setname_np")
Signed-off-by: Jonathan Gray <jsg@jsg.id.au>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5630>
2 files changed