Fixing CVE-2024-34397 caused regressions for ibus

According to https://github.com/ibus/ibus/issues/2639 and half a dozen duplicate bug reports in Debian, fixing CVE-2024-34397 has caused ibus to regress.

Some bug reports mention a warning Received GetNameOwner reply with invalid owner "org.freedesktop.IBus" for "org.freedesktop.IBus" which I think indicates that ibus is doing something very strange. Since fixing CVE-2024-34397, GLib has checked the D-Bus Specification rule that the owner of a well-known name is expected to be a unique name.

We might have to relax that check to say that the owner of a well-known name must be some sort of bus name, but not necessarily unique.

(And there I was hoping that now I could get back to my actual job.)