[PATCH] configure: check existence of python3 setuptools and dev package

[David Bremner]

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

> The notmuch2 CFFI-based Python interface is not buildable unless
> python3 dev package and python3 setuptools are installed.
>
> Check that these exist in configure (and disable notmuch2 bindings
> build if not) so that build of these bindings don't fail when make(1)
> is executed.

I pushed this.

I did notice that the existing python related checks are not as friendly
as some other parts of the configure script in terms of telling the user
what the consequences of a "No" answer to the check is.

d