Philip Withnall dc0eb5e49a gdbusauthmechanismsha1: Don’t delete a stale lock file if it’s changed
The retry loop for acquiring the lock for the authentication cookie file
currently tries to acquire the lock for 0.5s, then gives up, assumes the
lock file is stale, and deletes it.

That’s great if the lock file *is* stale because it’s been left there by
a crashed process.

It’s not so great if the lock file just happens to have been there every
time this process checked, because the cookie file is highly contested
while (for example) running lots of parallel unit tests.

Check for that situation by comparing the mtime of the lock file and
continuing to retry if it’s changed.

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

Fixes: #1929
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