GitLab

* Automatically switch --external-ortp and --external--mediastreamer
  to "enabled" when neither mediastreamer nor oRTP subdirectories can be found.

* Create an empty liblinphone_gitversion.h when there is no .git repository.

That option had no more effect

Some utf8 strings were not translated into the locale charset before
being passed to Liblinphone.

fix problem with video device being set many times for nothing in the property box, which creates graph stop/start when in a video call

Denying a friend to subscribe presence was no more possible
once we accepted.

Fix regression: system environment was no more used to generate the primary contact URI on first Linphone's start