[PATCH 1/2] build: fix out-of-tree builds, again

[David Bremner]

Jani Nikula <jani at nikula.org> writes:

> Broken, again, by yours truly in bc11759dd1fd ("build: switch to
> hiding libnotmuch symbols by default"). Reference notmuch.sym via
> $(srctree).

pushed this first patch to master

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