[neomutt-devel] git version string

[Richard Russon]

I've just re-instated darnir's git version suffix.
When developing, a typical version string might look like:

    NeoMutt 20161126-4-bee236-dirty (1.7.1)

Components:
- Date of last release
- Number of commits since release
- Git commit hash of last commit
- 'dirty' if there are uncommitted changes
- Upstream Mutt version

It's appended wherever a version string is displayed, e.g. "User-Agent:"

The version suffix (-4-bee236-dirty) is checked EVERY time you run make.
However, unlike the original version, changes will only require the
rebuilding of git-ver.c

To keep things simple for the downstream distros, there are some
limitations in place:

The NeoMutt date (20161126) and the upstream Mutt version (1.7.1) are
hard-coded into configure.ac and hence the Makefile.

The suffix will be empty if:
- git isn't present
- The source isn't in a git repo
- There aren't any "neomutt-*" tags

Let me know if you find any problems.

Cheers,
    Rich
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