Bugzilla Bug 302212: allow Mac OS X x86 builds to target SDKs.  The patch is contributed by Mark Mentovai <mark@moxienet.com>. r=wtc,joshmoz.
Bugzilla Bug 302212: allow Mac OS X x86 builds to target SDKs.  The patch
is contributed by Mark Mentovai <mark@moxienet.com>. r=wtc,joshmoz.

ekr/nss-old,nmav/nss,nmav/nss,nmav/nss,nmav/nss,ekr/nss-old,ekr/nss-old,ekr/nss-old,ekr/nss-old,nmav/nss,nmav/nss,ekr/nss-old,nmav/nss,ekr/nss-old