FS-10865: [mod_conference] conference transfer event reports incorrect info in New-Conference-Name #resolve

FS-10749: [mod_amqp] Crash on unload after mod_amqp reloaded with  command + incorrect command behavior #resolve

FS-10867: [freeswitch-core] Prevent stack smash when queing multiple sound files without event-lock #resolve

FS-10860: [core] Distorted music when playing it as local stream into a conference as hold music #resolve

FS-10854: [mod_conference] Canvas FG Image not refreshed before writing to video recordings #resolve

FS-10803: [mod_conference] Add support for alternate video layout config per conference profile #resolve

Fixes build but must be tested at runtime.

Previously rtp_secure_media_mki channel variable was checked only
for existence, now it is checked if it's defined and evaluates
to true with switch_channel_var_true().