Fix for test-bus unit test on Windows while running the check_segfault_no_auto_start test

[Ralf Habacker]

Am 26.04.2016 um 15:58 schrieb Simon McVittie:
> I assume you also see a noticeable (multiple seconds) delay before the
> message "Failed to activate service
> 'org.freedesktop.DBus.TestSuiteSegfaultService': timed out"?
| This works on Unix, and this is the first I've heard about it failing
on Windows. (Ralf, presumably this test works OK for you?)

Remember that we add some exit code handling with at
https://bugs.freedesktop.org/show_bug.cgi?id=92721, which fixed it at
that time.

Retest results see bug https://bugs.freedesktop.org/show_bug.cgi?id=95155

Ralf