Bug 209890 enabled the use of XCBuild by default. Since then, some build issues have shown up. While addressing them, temporarily turn off the use of XCBuild by default.
<rdar://problem/63764632>
Created attachment 400601 [details] Patch
Note that there are important steps to take when updating ANGLE. See http://trac.webkit.org/wiki/UpdatingANGLE
Committed r262308: <https://trac.webkit.org/changeset/262308> All reviewed patches have been landed. Closing bug and clearing flags on attachment 400601 [details].