Safer to do a check in CMake and set the default in PlatformHave.h.
Created attachment 429907 [details] Patch
Comment on attachment 429907 [details] Patch r=me if the bots are happy
Committed r278178 (238221@main): <https://commits.webkit.org/238221@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 429907 [details].