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

[Andrew Cagney]

New commits:
commit 51387341294fded356266894218ae3d08960f69c
Author: Andrew Cagney <cagney at gnu.org>
Date:   Tue Jul 16 12:45:50 2019 -0400

    ip_address: finish eliminating isunspecaddr() and unspecaddr()
    
    Missing from c7de5ff19a015e42da0f9994bcaeaac5e6a6276d.