Somebody changed JSC to always be a shared library, but failed to update the option description a couple lines above. JSC doesn't belong in this conditional anymore anyway.
Created attachment 298756 [details] Patch
Comment on attachment 298756 [details] Patch Clearing flags on attachment: 298756 Committed r210734: <http://trac.webkit.org/changeset/210734>
All reviewed patches have been landed. Closing bug.