feeds: fix old.packages up to use the version when we forked new packages

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@41987 3c298f89-4303-0410-b956-a3cf2f4a3e73