Updated cad/klayout to 0.24.9
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From: http://klayout.de/development.html
Release date: 2016-11-29
Enhancements: The RBA::Region#smooth function was enhanced to give
      somewhat better results
Enhancements: DXF's circle approximation can now also specified
      through an "accuracy" parameter: if less than the number of specified
      points is required to achieve the given accuracy, the number is
      reduced accordingly. This also applies to the polygon interpolation
        of spline and arc curves.

Enhancement: RBA integration now is compatible with Ruby 2.3 which
      allows building on Ubuntu 16 as well.
Enhancement: OASIS files with instance angles >360 were rejected
      before. Now, this has turned into a warning.

Bugfix: DEF reader was failing to read MASK/via combinations.
Bugfix: The marker browser's "show only rules with errors" option was
enabled again on sorting of errors.
Bugfix: DRC: Using Layout objects for inputs didn't work
Bugfix: Copying Hierarchy treets containing PCell's made the PCell's
  being turned into static cells.

(mef)