quilt: move empty quiltrc to native sysconfdir

quilt: move empty quiltrc to native sysconfdir

patch.bbclass orignally pointed at /usr/bin/quiltrc for an empty
version to ensure that no user setting were picked up, change this
to /etc/quiltrc in the Native sysroot since we now have a native
sysconfdir.

Make sure that the quiltrc is actually installed in the Native
sysconfdir, not the target, so fix this after the recipe split.

Signed-off-by: Saul Wold <sgw@linux.intel.com>