[Bug 69194] stop Gabble using things deprecated in 0.20, 0.22

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69194

--- Comment #3 from Simon McVittie <simon.mcvittie at collabora.co.uk> ---
Created attachment 85584
  --> https://bugs.freedesktop.org/attachment.cgi?id=85584&action=edit
exec-with-log.sh.in: fix out-of-tree use of GABBLE_TEST_BACKTRACE

---

commit name needs amending to what I said here

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