adium: add release checking script

We want to avoid broken Adium release files like in 1.18.4.
media: avoid segfault in fill_zero_tcp_act_ports_from_tcp_pass()
sdpmsg: don't create 'setup' attribute in media_to_string()

Actually 'active' and 'passive' were inverted and thus wrong all the
time without affecting anything.
media: rename update_remote_media -> update_call_from_remote_sdp