Builds of libwebrtc are using yasm before Xcode has had a chance to sign it. Fix by disabling formal code signing, so that the linker performs adhoc signing. This should be safe since yasm is never used off of the machine it's built on.
Committed 262658@main (d28d0a98a947): <https://commits.webkit.org/262658@main> Reviewed commits have been landed. Closing PR #12449 and removing active labels.
<rdar://problem/107698523>