Replace legacy-build-copy-nested-headers.py with an xcodebuild invocation
Created attachment 452806 [details] Patch
Created attachment 452812 [details] Patch
Stopped https://ews-build.webkit.org/#/builders/70/builds/988 because the 3 failures you saw there were known.
<rdar://problem/89303115>
Committed r290335 (247656@main): <https://commits.webkit.org/247656@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 452812 [details].