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), heiwa (linuxppc64-BE), tejeda (mac32-LE), linew (solaris-BE), cmake
