OSX: Make machtest compile on 10.9

Added the compiler options, we need the info of sdk.

Task-number: QTBUG-32715
Change-Id: I70612f36a16e0ab5025194a10ce399822e159c7c
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>