* #5949: remove more unused variable warnings

sflphone-common/libs/iax2/iax.c

sflphone-common/src/audio/audiorecord.cpp

sflphone-common/src/audio/audiorecord.h

sflphone-common/src/audio/audiortp/AudioRtpRecordHandler.cpp

sflphone-common/src/audio/codecs/celtcodec.cpp

sflphone-common/src/audio/sound/audiofile.cpp

sflphone-common/src/audio/speexechocancel.cpp

sflphone-common/src/config/config.cpp

sflphone-common/src/config/yamlnode.cpp

sflphone-common/src/dbus/callmanager.h

sflphone-common/src/dbus/configurationmanager.h

sflphone-common/src/dbus/instance.h

sflphone-common/src/iax/iaxvoiplink.cpp

sflphone-common/src/managerimpl.cpp

sflphone-common/src/sip/SdesNegotiator.cpp