Remove universal build support from configure.

Remove universal build support from configure.

Qt 5 will support single-arch builds only, for two
reasons:
1) PPC is very deprecated at this point, x86_64
   is becoming standard.
2) V8 only supports single arch builds.

As a workaround, build twice and use lipo to
create universal binaries.

This commit also removes the -cocoa and -carbon
options.

Change-Id: I428f096a02f59ec2b3e693150e0e08358198de83
Reviewed-by: Morten Johan Sørvig <morten.sorvig@nokia.com>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>