HDFFV-8156: perform/benchpar failed to run

Benchpar.c is retired/deleted. If it is ever needed, it can be retrieved from the SVN repository
or even previous version of HDF5 source code.

Tested: jam parallel make passed.


git-svn-id: https://svn.hdfgroup.uiuc.edu/hdf5/trunk@25909 dab4d1a6-ed17-0410-a064-d1ae371a2980