hdf5_ep

[svn-r21239] Description:
  Merged from HDF5 trunk r21237.
  Add test cases for HDFFV-7656 - "--delta=something" considers two NaN of the same type are different.
  The fix was added (r21105) before but test cases were incorrectly added and missing for cmake script.

Tested:
  jam (linux32-LE), koala (linux64-LE), tejeda (mac32-LE), cmake (jam)