pthread: add pthread_{getname_np,setname_npp}

- These two functions imported for Linux/BSD compability.

Signed-off-by: Han Pengfei <pengphei@qq.com>
Change-Id: I3e9cada26f1ed043bfaed83e8185dcfff3bd71e2
Reviewed-on: https://review.haiku-os.org/c/haiku/+/5746
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

s/Haiku License/MIT License/g.

They are the same thing.

pthread: add pthread_getattr_np.

non standard extension, but widely available to obtain attributes for a thread.
also provides an alias for pthread_getattr_np which is the bsd equivalent.

Change-Id: I26ef8245ed2537186f48c8b8bdf3e42b03e70892
Reviewed-on: https://review.haiku-os.org/c/1172
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>