CMake: Silence a warning about HDF5_ROOT containing NOTFOUND #14724
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The FindHDF5.cmake package might set HDF5_DIR to "HDF5_DIR-NOTFOUND"
(even though it finds and configures an HDF5 installation without a
problem). This isn't terribly elegant, but us setting HDF5_ROOT to that
variable triggers a bogus warning.
Thus filter the invalid name.