hdf5_ep

Merge pull request #475 in HDFFV/hdf5 from ~DEROBINS/hdf5_der:hdf5_1_8 to hdf5_1_8

* commit '932e1883035d2c676bbaa129d44e57a180804d14':
  Ran bin/reconfigure on jam after changes to make_err.
  Added missing #ifdef __cplusplus macros to H5Epubgen.h. Fixes HDFFV-9638.