Revert change r25701: Add LD path to HDF5 install directory to address HDFFV-8944.

The change broke DESTDIR builds where an older HDF5 is installed in the --prefix directory.
The original problem remains.

Tested with h5committest


git-svn-id: https://svn.hdfgroup.uiuc.edu/hdf5/trunk@25912 dab4d1a6-ed17-0410-a064-d1ae371a2980