Support FEATURES=qa-unresolved-soname-deps (bug 708448)

Support FEATURES=qa-unresolved-soname-deps so that it's possible to
disable the QA warning that was introduced for bug 704320. This is
useful for systems that may have incomplete PROVIDES metadata due
to alternative package managers or experimentation with a new
architecture.

Bug: https://bugs.gentoo.org/708448
Bug: https://bugs.gentoo.org/704320
Signed-off-by: Zac Medico <zmedico@gentoo.org>
4 files changed