Improve package_fixsymlinks so we don't handle RDEPENDS for every single package
in PACKAGES.
(From OE-Core rev: 20ff8feb95d54e4db646f8c0cb006ce187e288af)
(From OE-Core rev: ca2ee871f82dd0ba4122a8373e4efd21cec5722b)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>