Fix bugs in the HDF5 easyblocks

The configure option of HDF5 for Szip is actually --with-szlib and not --with-szip.
This is documented in http://www.hdfgroup.org/ftp/HDF5/current/src/unpacked/release_docs/INSTALL
I verified that this option is valid for HDF5 1.8.7, 1.8.9, 1.8.10 and 1.8.11.