git-version-gen: Don't check for .git directory

This check is not in all our repos that use git-version-gen. Indeed it
seems to be a leftover of openbsc where I think it wanted to ensure
being called in the openbsc subfolder or something? libosmocore e.g.
doesn't have it.

In any case .git being a directory is not always true (if using git
worktree) so remove this check.

Change-Id: I414111b27db9951314e6bc7eff8bc1f10775b3ff
1 file changed