gio: make client connection work with EXTERNAL on win32

D-Bus reference implementation doesn't require more than the claimed
process SID as part of the AUTH initial data for EXTERNAL.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
10 jobs for dbus-external-sid in 29 minutes and 53 seconds (queued for 5 seconds)
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