Also fix RPM scriptlet dependencies for udev-less installs:
Adjust %postun to skip udevadm when udevd isn't accessible, matching
%post. This lets the package install and remove inside a container or
rpm-ostree system without udev.
Move the /usr/sbin/update-alternatives dependency to the
initscripts-updown subpackage, which is the only consumer, and drop the
systemd-udev Requires(post) from the main package.
Backport of upstream 09e2de8b.
Resolves: RHEL-93551
Resolves: RHEL-126543
Resolves: RHEL-149149
Resolves: RHEL-126455
Resolves: RHEL-129186
Resolves: RHEL-140113
Resolves: RHEL-182559
Signed-off-by: Josephine Pfeiffer <josie@redhat.com>
