Add reallocarray(3) and strtonum(3) to lib/libc/include/namespace.h

[Kamil Rytarowski <n54%gmx.com@localhost>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

I would like to add the OpenBSD functions to lib/libc/include/namespace.
h.

The reasoning is that it seems correct as other libc functions are
there as well.

Any comments?
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
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=Z8Fw
-----END PGP SIGNATURE-----