Upgrade Linphone metadata and use up-to-date git revision
Remove binaries embedded within Linphone repository
Merge branch 'master' into 'master'

Update Linphone build file

I removed dependency to GCM (google cloud messaging).

I reenabled various codecs because I do not see any reason to disable them a priori. Can you confirm?

See merge request !380
Linphone: Add maintainer note.
New app: LocalGsmNlpBackend