Changes to what mirror we happen to fetch from shouldn't cause rebuilds.
(From OE-Core rev: 168f3d71bcfc9daa2984c21f35e2a2fdf754c57c)
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>