BUG: Examples should build if BUILD_TESTING is OFF

With BUILD_EXAMPLES:ON and BUILD_TESTING:OFF, the Examples should
compile.

To configure VTK with BUILD_EXAMPLES:ON and BUILD_TESTING:OFF, from an
empty build tree,

cmake  -DBUILD_TESTING:BOOL=OFF -DCMAKE_BUILD_TYPE:STRING=Release vtk_src_tree

NOTE: If you have already configured VTK with default settings, you
must clean the build tree and rerun cmake with the above
setting. Otherwise, bogus tests will remain.

Change-Id: I2035e49c7df4ba6f3d88447ea1b768ec63b87ee7
Merge topic 'ExamplesWithoutTesting' into master

3c68fe1f BUG: Examples should build if BUILD_TESTING is OFF
Merge topic 'fix_ogg_support' into pv-master

227749c Cleanup OggTheora support.
Merge topic 'fix-image-append' into pv-master

710ce99 BUG #14086: Fix vtkImageAppend when no active scalars are present.
Merge remote-tracking branch 'pvvtk/pv-master' into HEAD

* pvvtk/pv-master:

Change-Id: I7f71aa9bb43a83428d5addca276a73e48d40f840