GitLab

Conflicts:
	coreapi/linphonecall.c

gtk: set LANGUAGE env variable as well as LANG on MacOSX because HomeBrew gtk version use LANGUAGE while macports gtk version use LANG...

linphone_core_remove_listener() can safely be called from within a callback.
don't destroy the vtable in linphone_core_destroy(), similar to what is done with linphone_core_remove_listener().

call_tester: if download bandwidth is not enough for both audio and video, we still expect video to be sent to the lowest bitrate possible