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hdf5: avoid empty "enable parallel" flag

Ben Boeckel requested to merge ben.boeckel/common-superbuild:hdf5-non-empty-parallel-flag into master

This flag ends up in hdf5-config and, if empty, ends up becoming set(HDF5_ENABLE_PARALLEL) which is unset and then confuses VTK's FindHDF5 which forwards it to HDF5_IS_PARALLEL and trips the NOT DEFINED HDF5_IS_PARALLEL check inside of VTK itself.

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