package/linphone: bump to version 4.3.1

package/linphone: bump to version 4.3.1

- Update site to get latest release
- License is GPL-3.0+ since version 4.3.0 and
  https://gitlab.linphone.org/BC/public/liblinphone/commit/2bc924c184e2f00f1be3f82a736bccaeacce106e
- Switch to cmake-infrastructure
- Remove most of the existing dependencies (alsa, speex, libupnp, ...)
  as they are now only managed in mediatreamer
- Add external dependencies: belr, belle-sip, libxml2, mediastreamer,
  sqlite
- This bump is needed as current linphone does not build with latest
  libeXosip2

Fixes:
 - http://autobuild.buildroot.org/results/ed8bdcbfb7d453ed7d436bada35417ee305e6ac9

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>