Log Message:
notmuch, notmuch-emacs: Update to 0.38.2

Changelog:
What's new in notmuch 0.38.2
=========================

Library
-------

Make sorting of string maps lexicographic on (key,value) pairs. This
avoids some test failures due to variation in message property output
order.

Emacs
-----

Avoid extra separators after the last address in `notmuch-emacs-mua`.