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

[Andrew Cagney]

New commits:
commit f468ce9517de6106d11bf2660948f3c821a67889
Author: Andrew Cagney <cagney at gnu.org>
Date:   Tue Dec 22 14:31:42 2020 -0500

    ip: misc cleanups
    
    - sprinkle const across: extern ip_.... unset_...;
    - drop ..._is_set()