Teach the Apple port how to build the test tools in build-webkit

  Teach the Apple port how to build the test tools in build-webkit
      https://bugs.webkit.org/show_bug.cgi?id=89540

      Reviewed by Jon Lee & Simon Fraser.

      * BuildSlaveSupport/build.webkit.org-config/master.cfg:
      (RunWebKitTests.start): pass --no-build since tools should now be in the downloaded archive
      (RunUnitTests.start): ditto
      * Scripts/build-webkit: add tools to the projects build list

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121302 268f45cc-cd09-0410-ab3c-d52691b4dbfc