systemd rpm macros contain --user --global options clash

[tguruswamy]

Since at least v217 / 7c67f0f, systemd/src/core/macros.systemd.in has contained scriptlets to help with rpm packages providing user services, of the type

%systemd_user_preun() \
if [ $1 -eq 0 ] ; then \
        # Package removal, not upgrade \
        systemctl --no-reload --user --global disable %{?*} > /dev/null 2>&1 || : \
fi \
%{nil}

However --user --global is actually an options clash. Luckily --global was specified last so the macros function as intended at the moment, but this did cause considerable confusion as a packager as to what these macros were actually doing and whether they worked.