Remove the macOS SDK maximum version check

Upstream Spidermonkey has removed the SDK maximum version check ( https://bugzilla.mozilla.org/show_bug.cgi?id=1707953 )
Our patch added in rP24644 is broken on MacOs 12 and it seems logical to follow upstream in simply removing the check.

Patch by: Langbart

Reviewed By: wraitii

Closes #6346

Differential Revision: https://code.wildfiregames.com/D4320