This is to allow language-specific classes (e.g., vtkPythonAlgorithm) to
exclude themselves from languages known not to be supported. A blacklist
is used because there exist things like lunatic (a two-way Lua ←→ Python
bridge) and new any languages should try to wrap as much as possible.

Change-Id: I81ee4c8df2ad74d158adb2b673b2413703a730ec