gmessages: Support namespaced journals

Philip Withnallrequested to merge
pwithnall/glib:2530-namespaced-journald into main

Spotted and diagnosed by Ilya Basin.

Signed-off-by: Philip Withnall pwithnall@endlessos.org

Fixes: #2530 (closed)

Closes #2530 (closed)

Merge request reports