hdf5_ep

[svn-r12110] Purpose:
Optimization

Description:
Get rid of unnecessary function call for systems that don't have rand_r.

Solution:
If rand_r isn't present on a system, then macros can be used to simply call
the underlying random function instead of calling the HDrand/HDsrand functions
that keep track of the random seed within the library.


Platforms tested:
heping (minor change)

Misc. update: