When using the system content path, we need to create the symlink to the system content path earlier in the installhdrs phase instead of the later install phase. This is so other projects can build in parallel.
<rdar://92435349>
Created attachment 458690 [details] Patch
Committed r293724 (250212@main): <https://commits.webkit.org/250212@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 458690 [details].