apparently some sip device vendors did not read the RFC (who knew?) adding verbose_sdp=true var to add needless a= lines for standard iana codecs that explicitly do not require them

Do at least *SOME* verification to make sure that we are getting an IP address in the blacklist list

Implement switch_queue_pop_timeout() and refactor sofia_profile_worker_thread_run() to use it so it doesn't wake up too often

freetdm: use m4_ifdef() to check for pkg-config macros and print a warning if they are not available

...instead of failing at runtime
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

ftmod_isdn: Port(/Fix) span signal handling, remove some dead/unused pieces and close the D-Channel on shutdown.

This fixes a NULL-call segfault in ftdm_span_trigger_signal().
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>

I really need to dig deeper here, some libpri events never fire for
incoming calls and i'll have to find out how mod_freetdm or the
FreeSWITCH core change states on the channel...

Anyway, incoming and outgoing calls still work for me (BRI PTMP TE),
so commit this now and let a wider audience do some more testing.
Signed-off-by: Stefan Knoblich <s.knoblich@axsentis.de>
Tested-by: Stefan Knoblich <s.knoblich@axsentis.de>