The rewritten version of gni-to-cmake.py requires the Python module `ply`.
<rdar://problem/104846569>
Pull request: https://github.com/WebKit/WebKit/pull/9360
Committed 259601@main (3ee9fb435eaa): <https://commits.webkit.org/259601@main> Reviewed commits have been landed. Closing PR #9360 and removing active labels.