[homebrew] Update notmuch to version 0.18 (#29497)

[Wael Nasreddine]

Jack Nagel <notifications at github.com> writes:

>>Are you suggesting linking notmuch statically? or zlib?
>
> Linking notmuch to zlib statically.

@David, do you know how can I build notmuch statically built against
zlib? I tried with `ZLIB_LDFLAGS=-Wl,-Bstatic make` but it does not seem
to have an effect on the linking process.

For context, please see https://github.com/Homebrew/homebrew/pull/29497

>
> ---
> Reply to this email directly or view it on GitHub:
> https://github.com/Homebrew/homebrew/pull/29497#issuecomment-44041238
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Wael Nasreddine | SRE at Google | wael.nasreddine at gmail.com | (650) 735-1773
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