hdf5_ep

[svn-r3637] Purpose:
    Bug Fix
Description:
    On the Nersc machines, the install-sh script wasn't being found in
    the proper place.
Solution:
    Corrected the "fix" I put in there awhile ago. Essentially, if the
    INSTALL macro is the program "install-sh" with anything around it,
    then we assume they want our install-sh program and force the
    Makefiles to find it in the hdf5/bin directory.
Platforms tested:
    Nersc.