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+ turn HAVE_BZRTP into HAVE_ZRTP to be in sync with mediastreamer2 define

* 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.

This reverts commit 28ced75b.

- better integration with network reachability callback
- fix crashes (mTunnelClient can no longer be NULL)
- avoid useless operations during transcient states
- clarify source code
- allow the application to set root_ca before the tunnel connection actually starts.

This reverts commit 6bbad729.

This reverts commit 602f480d.

Fix crash in linphone_call_update_ice_from_remote_media_description() when building with GCC >= 4.9 and -O2.

Fix crash in linphone_call_update_ice_from_remote_media_description() when building with GCC >= 4.9 and -O2.