hdf5_ep

[svn-r18127] Purpose:
    Fix for bug1749: Incorrect code in diff() function for links compare
    Also removed duplicated redundant code, which improves performance.

Description:
    When comparing file1 to file2 and both files contain same soft-links and/or
    external-links, if file2's target object path name is longer than file1's
    target object path name, the current code allocates memory buffer 
    incorrectly, so it could end up buffer overflow or wrong result.

Tested on Jam.