FreeSWITCH

Merge pull request #487 in FS/freeswitch from ~DRAGOS_OANCEA/freeswitch-dragos:opus-keep-fec-on-improvements-loss to master

* commit '6385fb863a7e800dbb2668fd0ed4e1203b1ba18e':
  FS-8161: mod_opus: Keep FEC enabled only if loss > 10 ( otherwise PLC is supposed to be better)