ConfigureBuild needs to be converted to a new-style step so that we can convert all requests it makes to defered requests.
<rdar://problem/105040790>
Pull request: https://github.com/WebKit/WebKit/pull/9644
Committed 261268@main (8e81fa5f263f): <https://commits.webkit.org/261268@main> Reviewed commits have been landed. Closing PR #9644 and removing active labels.