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

[D. Hugh Redelmeier]

New commits:
commit f01486bbd06322d73ce782f98334d5a5c37b51a7
Author: D. Hugh Redelmeier <hugh at mimosa.com>
Date:   Fri Jul 20 22:16:59 2018 -0400

    pervasive: use PRINTF_LIKE and UNUSED instead of bulky GCC-isms