where $submodurl comes from the $TRASH_DIRECTORY the user
gave us. However, git will resolve symlinks when converting
the relative path into an absolute one, leading them to be
textually different (even though they point to the same
directory).
Fix this by asking pwd to canonicalize the name of the trash
directory for us.
Signed-off-by: Jeff King <peff@peff.net> Acked-by: Jens Lehmann <Jens.Lehmann@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>