src: s/--use-wheel//

src: s/--use-wheel//

--use-wheel was deprecated in favor of --only-binary in pip v7.0.0. and
--use-wheel was removed in a recent release of pip. but some packages
are source packages, so we cannot simply replace use-wheel with
only-binary. so a simpler approach is to drop --use-wheel option, as pip
respects --find-links, and will find the required package from the
wheelhouse.

Signed-off-by: Kefu Chai <kchai@redhat.com>