vchoi_fork

[svn-r8370] Purpose:
Bug fix.

Description:
Not all machines (like Sun and AIX) support fabsl() and fabsf() used
in test/dtypes.c.  Changed the coding to use macro names HDfabsl and
HDfabsf.  Also set the two macros to use ABS for now so that they will
work for all machines. (need more portable fixes which would involve
configure.)

Platforms tested:
h5committested. (also tested in LANL QSC and Theta).