hdf5_ep

[svn-r9774] Purpose: Bug fix

Description:  integer->long double conversion test failed on some of Linux
systems(mir and eirene) when Intel compiler is used.  I'm not able to repeat
the problem.  So I just made a best guess and fix it.  The problem is minor.
The long double on Linux is 12 bytes long but precision is 10 bytes.  The
unused 2 bytes may have garbage in them causing value comparison wrong.


Platforms tested: mir and eirene with Intel compiler.