Xcode appears to be `mkdir -p`ing the script phase's output files automatically, causing some invocations to create empty directories in the DSTROOT.
Created attachment 449542 [details] Patch
rdar://87777915
<rdar://problem/87804004>
Committed r288293 (246217@main): <https://commits.webkit.org/246217@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 449542 [details].