cleanup payloads at linphone_core_destroy() add gsm/22050
cleanup payloads at linphone_core_destroy()
add gsm/22050

git-svn-id: 8f60b0cb95795e7f2da4f2192af0e1f6ffac8291@716 3f6dc0c8-ddfe-455d-9043-3cd528dc4637

Linphone-sync/oRTP,avis/ortp,carpikes/ortp,Linphone-sync/oRTP,videomedicine/oRTP,jiangjianping/ortp,dozeo/ortp,avis/ortp,Linphone-sync/oRTP,carpikes/ortp,caizw/ortp,VTCSecureLLC/ortp,caizw/ortp,dozeo/ortp,wugh7125/ortp,Distrotech/oRTP,samueljero/linphone-oRTP,Distrotech/oRTP,avis/ortp,jiangjianping/ortp,VTCSecureLLC/ortp,wugh7125/ortp,carpikes/ortp,VTCSecureLLC/ortp,jiangjianping/ortp,samueljero/linphone-oRTP,samueljero/linphone-oRTP,dozeo/ortp,Distrotech/oRTP,caizw/ortp,videomedicine/oRTP,videomedicine/oRTP,dmonakhov/ortp,dmonakhov/ortp,wugh7125/ortp,dmonakhov/ortp