slang: add PREMIRRORS to handle upstream moving tarballs
The slang maintainer only puts the current release at
jedsoft.org/releases/slang/slang-1.2.3.tar.bz2, all previous releases are moved
into /releases/slang/old/.
As this breaks the fetch the moment a new version is released, use PREMIRRORS to
also look in the /old/ directory.
(From OE-Core rev:
50d49766ab76b67e312f6a1d91977a40d1020919)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster808@gmail.com>
