rpm links to libmagic from file so it needs to be listed in DEPENDS else we
can have race conditions causing build failures such as those seen on the
autobuilder recently.
(From OE-Core rev: 432e36300d7231c9b01cd2c6c4b39b84cf4fddca)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>