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fix CMAKE_PREFIX_PATH as environment variable with multiple paths

David E. DeMarle requested to merge demarle/common-superbuild:fix-multiple-cmake_prefix-paths into master

At LANL, superbuild setup bash scripts use the CMAKE_PREFIX_PATH environment variable to define system library search locations. The superbuild sees and uses that in its own cmakecache, but the paraview build inside only gets the first path.

With this change all of the search paths survive into the paraview build's cmakeCache, where they are then prepended with the superbuilds's install directory where everything it builds is found.

Backport: paraview/release

Edited by Ben Boeckel

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