hdf5_ep

Merge pull request #2153 in HDFFV/hdf5 from ~BYRN/hdf5_adb:develop to develop

* commit 'ac87f12afe73fa22dcf31d9aeba05a259e215765':
  Remove const
  Fix compile error - declaration after executable statement
  Adjust cache.c only variables.
  Fix include to correct memory calls - big-endian issue.