Updates to hdf5 automake macro

Merged Matthieu Schaller requested to merge hdf5_detection into master

Two updates:

  • Got new version of the ax_lib_hdf5.m4 macro. I have ported our changes to that new version.
  • Fixed an issue encountered on the HLRS system. Their h5cc -show call returns a multi-line output which was then assigning a multi-line output to $HDF5_CC which then creates a problem in the generated Makefile.

What do you think?

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