Clean up architectures in xcconfig files and add a new one.
<rdar://problem/15659703>
Created attachment 220911 [details] Patch v1
Comment on attachment 220911 [details] Patch v1 Clearing flags on attachment: 220911 Committed r161713: <http://trac.webkit.org/changeset/161713>
All reviewed patches have been landed. Closing bug.