[PATCH v2] configure: fix out of tree build; check unsafe characters in srcdir

[David Bremner]

Tomi Ollila <tomi.ollila at iki.fi> writes:

> While check for GMime session key extraction support... was made
> out of tree build compatible, related (and some unrelated) unsafe
> characters are now checked in notmuch source directory path.

pushed.


Note that while notmuch builds out of tree, the test suite is currently
broken, and even more broken with spaces in the build path.

d