Add check for weak linked symbol PLQueryRegistered on macOS.
Pull request: https://github.com/WebKit/WebKit/pull/3782
*** Bug 244511 has been marked as a duplicate of this bug. ***
Committed 254002@main (3950cf6c556c): <https://commits.webkit.org/254002@main> Reviewed commits have been landed. Closing PR #3782 and removing active labels.
<rdar://problem/99395723>