cleanup: remove #if 0'ed function initiate_untrusted_session() from ssl.c.

Has been inside the #if 0 since 'git tree epoch' (sept-2005) and was not
referenced, from either code, nor dead code nor comment.

Signed-off-by: Steffan Karger <steffan@karger.me>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1404336688-15036-1-git-send-email-steffan@karger.me>
Signed-off-by: Gert Doering <gert@greenie.muc.de>