visionOS: WKTR TestWTFAlwaysMissing fails to build
<rdar://problem/119502325>
Pull request: https://github.com/WebKit/WebKit/pull/21641
Committed 271887@main (3fc47d1bb773): <https://commits.webkit.org/271887@main> Reviewed commits have been landed. Closing PR #21641 and removing active labels.