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: I976dd4ff20cc5b220b244b1fb6192c0528c32638
1 file changed