Applied patch http://auditing-sshd.googlecode.com/svn/trunk/patch/isshd-6.2p2-nohpn.patch for NERSC Bro SSH instrumentation version 3.12 to branch nersc-isshd.
Channel.wfd_isatty was made AIX-only in 6.3, so re-enable it for NERSC iSSHD.