Add a script that will search feature defines (ENABLE, USE, HAVE macros) and be able to find differences between where they're located.
Pull request: https://github.com/WebKit/WebKit/pull/4428
<rdar://problem/100333957>
Committed 257596@main (b6841b91605e): <https://commits.webkit.org/257596@main> Reviewed commits have been landed. Closing PR #4428 and removing active labels.