Extra code added to handle output by h5cc and checking for existence of files did not handle /usr/lib and /usr/include correctly.

Pull request: https://github.com/EinsteinToolkit/ExternalLibraries-HDF5/pull/7 is one more step towards fixing this.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2875/handle-system-directories-when-looking-for