Pull request: fix for ./builder misbehaving when GIT_EDITOR is set.

[Paweł Zuzelski]

Hi all,

./builder is failing with a bit cryptic error when GIT_EDITOR is set.
https://github.com/pld-linux/rpm-build-tools/pull/1 should fix both the
failure when GIT_EDITOR is set and the error message when any other
unknown GIT_ variable is set.

Thank you,
Paweł