Giuseppe Scrivano d6d871208c GDBusServer: If no initial response for EXTERNAL, send a challenge
Sending an "initial response" along with the AUTH command is meant
to be an optional optimization, and clients are allowed to omit it.
We must reply with our initial challenge, which in the case of EXTERNAL
is an empty string: the client responds to that with the authorization
identity.

If we do not reply to the AUTH command, then the client will wait
forever for our reply, while we wait forever for the reply that we
expect the client to send, resulting in deadlock.

D-Bus does not have a way to distinguish between an empty initial
response and the absence of an initial response, so clients that want
to use an empty authorization identity, such as systed's sd-bus,
cannot use the initial-response optimization and will fail to connect
to a GDBusServer that does not have this change.

[Originally part of a larger commit; commit message added by smcv.]

Signed-off-by: Simon McVittie <smcv@collabora.com>

(cherry-picked from commit a7d2e727eefcf883bb463ad559f5632e8e448757)
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