Examples/Infovis: fix bogus find_package call
The example was reporting that VTK was not found no matter what because
find_package was not actually being called. Fix the syntax used around
it and update the rest of the code to actually work.
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The example was reporting that VTK was not found no matter what because
find_package was not actually being called. Fix the syntax used around
it and update the rest of the code to actually work.