Thread: Re-add pthread_np.h include for FreeBSD/OpenBSD
Thread: Re-add pthread_np.h include for FreeBSD/OpenBSD

Was a regression from #45315.

Fixes #46998.

(cherry picked from commit 7a64819c2fa839eb6ce198285fdc2dc65493d062)

ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot,ex/godot