BUG: Revert default VTK backend to OpenGL

[msmolens]

Revert the default VTK backend to OpenGL. Because the OS X factory
machine targets OS X 10.6 (CMAKE_OSX_DEPLOYMENT_TARGET:STRING=10.6), the
Mac nightly builds don't find the required OpenGL version. The error
message seen when running Slicer is:

vtkCocoaRenderWindow (0x125872400): VTK is designed to work with
OpenGL version 3.2 but it appears it has been given a context that
does not support 3.2. VTK will run in a compatibility mode designed
to work with earlier versions of OpenGL but some features may not
work.)

[msmolens]

Integrated in r25406.

[pieper]

Thanks

On Tue, Oct 4, 2016 at 11:41 AM, Max Smolens [email protected]
wrote:

Closed #595 Slicer/Slicer#595.

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[msmolens]

Update:
I tested building Slicer/OpenGL2 on factory-south (OS X 10.11) with CMAKE_OSX_DEPLOYMENT_TARGET:STRING=10.10 and can confirm that the VTK error about OpenGL 3.2 no longer appears.