- systemd.spec: %regenerate_initrd_post is only used by udev sub-package hence
move the build requirement pulling this macro in in the list of udev BRs.

- Don't ship after-local.service anymore. This was mostly a hack for people
wanting to execute any random things once the boot was finished. We shouldn't
encourage such practice and it actually conflicts with the sysv-generator
which believes that /etc/init.d/after.local is SysV init script that needs to
be converted into a native unit file.
We still install a copy of this service in /etc if the user is relying on
it, for backward compatibility.

- fixlet-systemd-post.sh: fix invalid use of rpm macro %{_localstatedir}