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hdf5: set HDF5_ROOT

Ben Boeckel requested to merge ben.boeckel/common-superbuild:hdf5-root into master

This skips the config-based searching for HDF5 in FindHDF5. The config module for HDF5 uses imported targets which causes issues in VTK's module system if they are used (the third party support expects paths, not targets), or on Windows, the paths to the .dll files end up on the link line which doesn't work. Setting HDF5_ROOT ends up skipping all of that and searching using find_library and such which works well enough for the superbuild.

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