The presence of a .git directory used to be good enough evidence that
GIT-VERSION-GEN could use 'git describe' to get a version number. But
now .git might as well be a file so the test must be extended to cater for
such setups.
Signed-off-by: Lars Hjemli <hjemli@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>