cifs: reinstate the forcegid option

commit 72bd481f860f0125c810bb43d878ce5f9c060c58 upstream.

Apparently this was lost when we converted to the standard option
parser in 8830d7e07a5e38bc47650a7554b7c1cfd49902bf

Reported-by: Gregory Lee Bartholomew <gregory.lee.bartholomew@gmail.com>
Cc: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>