hdf5_ep

[svn-r9819] Purpose: Bug fix

Description:  The fix of the loss problem of the last 2 bytes of mantissa on sleipnir has
not been successful.  It happens when converting from unsigned long long to long double.
 The failure has been on and off.

Solution:  Hard set a macro to disable unsigned long long->long double for FreeBSD until
a good solution is found to solve this elusive problem.

Platforms tested: sleipnir and fuss.  Only sleipnir is concerned.

Misc. update: