Ongoing fixes and improvements, transient suppressor is gone. Also,
dropping isac because it doesn't seem to be useful, and is just build
system deadweight now.
Upstream references:
Version: 131.0.6778.200
WebRTC: 79aff54b0fa9238ce3518dd9eaf9610cd6f22e82
Chromium: 2a19506ad24af755f2a215a4c61f775393e0db42
Since we cannot rely on the API to be stable upstream, let's start
making the pkg-config, library, and include dir have a version suffix.
This will allow different downstream projects depending on us to
independently switch versions without packagers having to jump through
hoops.
