Support for clang 3.1.  Use this by default when xcode is in the new location (checked with xcode 4.6).
Support for clang 3.1.  Use this by default when xcode is in the new location (checked with xcode 4.6).

dtebbs/tzbuild,turbulenz/turbulenz_build,turbulenz/turbulenz_build,dtebbs/tzbuild,dtebbs/tzbuild,turbulenz/turbulenz_build