hdf5_ep

Merge pull request #254 in HDFFV/hdf5 from ~BYRN/hdf5_adb:hdf5_1_8 to hdf5_1_8

* commit '4f3f30e63dfeb712142430e314679575f76ddba4':
  Update CMake required to version 3.2.2
  Remove callback functions that will fail (HDFFV-10046)
  Add copy of N files
  HDFFV-9994 port changes from develop. CMake folder changes brought up to standard.
  HDFFV-10046 Add callback functions to plugin test
  Add defines that are missing on OSX
  correct signature