Enable -Wformat=2 warnings for WebKitLegacy. This includes -Wformat-nonliteral among other warnings.
<rdar://problem/84681560>
Created attachment 442532 [details] Patch v1
Committed r285049 (243692@main): <https://commits.webkit.org/243692@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 442532 [details].