h4h5tools

Purpose:
    Bug Fix

Description:
    When converting this library to be compiled only by h5cc, I removed
    the "HDF5PATH" macro. This was necessary for the tests since it
    should point to the "correct" h5dump program.

Solution:
    Put in some code which gathers this path from the CC macro if it's
    set to the h5cc command.

Platforms tested:
    Linux (small fix).