Rubber-stamped by Darin.

    Rubber-stamped by Darin.

        - fix http://bugzilla.opendarwin.org/show_bug.cgi?id=8348
          upload-disk-image stage on buildslaves fail with "No space left on device"

        * BuildSlaveSupport/build-launcher-dmg:  Use the -srcfolder option to
          'hdiutil create'.   This creates the initial disk image based on the size of
          the source folder, and copies the contents to the new disk image.  The file
          extension on the temporary uncompressed disk image has also been altered from
          ".uncompressed" to ".uncompressed.dmg" as hdiutil on 10.4.6 Intel fails when
          the extension is not ".dmg".

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@13847 268f45cc-cd09-0410-ab3c-d52691b4dbfc