hdf5_ep

[svn-r15944] A follow-up checkin for the last-round commit(r15943).  Added a test in this script file to
check whether the macros H5_USE_16_API works properly.  There used to be a problem to compile
if H5_USE_16_API is defined in the application program (see bug #1264).

Tested on kagiso - simple change.