Re: [PATCH] Change GIT-VERSION-GEN to call git commands with "git" not "git-".

Sean [off-list ref] writes:

GIT-VERSION-GEN can incorrectly return a default version of
"v1.3.GIT" because it tries to execute git commands using the
"git-cmd" format that expects all git commands to be in the $PATH.
Convert these to  "git cmd" format so that a proper answer is
returned even when the git commands have been moved out of the
$PATH and into a $gitexecdir.

IIRC, the reason we spelled it as "git-describe"
with a dash is ancient git wrapper said "not a git command" when
given "describe" which it did not understand without failing.

I think it has been long enough since we introduced "git describe",
so this would be OK.