Do not compile some unneeded libwebrtc ObjC files
<rdar://91431764>
Created attachment 457532 [details] Patch
Hum, the classes are dynamically searched. We can rename the methods instead of compiling them out.
Created attachment 457682 [details] Patch
Committed r292910 (249680@main): <https://commits.webkit.org/249680@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 457682 [details].