adjust_shared_perm(): leave g+s alone when the group does not matter

Julien Moutinho reports that in an environment where directory does not have BSD group semantics and requires the g+s to be set (aka FORCE_DIR_SET_GID), but the system forbids chmod() to touch the g+s bit, adjust_shared_perm() fails even when the repository is for private use with perm = 0600, because we unconditionally try to set the g+s bit. When we grant extra access based on group membership (i.e. the directory has either g+r or g+w bit set), which group the directory and its contents are owned by matters. But otherwise (e.g. perm is set to 0600, in Julien's case), flipping g+s bit is not necessary. Reported-by: Julien Moutinho <julm+git@sourcephile.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>