bug fix release 0.18.1

[David Bremner]

In parallel with the usual merging of patches into master, I'd like to
put together a bugfix release with some build and portability fixes.

If you want to propose a tag for such a release, please tag it
notmuch::0.18.1 in nmbug.

I'd like to make such a release within two weeks from today (so, 26th of
May)

d
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