[Swan-commit] Changes to ref refs/heads/main

[Andrew Cagney]

New commits:
commit eb0d63f772f12ac0090a77b6782afea548b1e42b
Author: Andrew Cagney <andrew.cagney at gmail.com>
Date:   Sat Jan 2 19:52:51 2021 -0500

    ip: use *_is_unset() and not *_type()==NULL to determine an unset value

commit ab7de644829566156f28b5129f4cce1b43b05295
Author: Andrew Cagney <andrew.cagney at gmail.com>
Date:   Sat Jan 2 14:56:52 2021 -0500

    ip: change maskbits (nr routing prefix bits in a subnet) to unsigned

commit 2277300b149780e01913764e8d38fd942f5feea8
Author: Andrew Cagney <cagney at gnu.org>
Date:   Sun Jan 3 12:20:13 2021 -0500

    constants: add thingeq(L,R)