lastlog with hp-ux 10.20

[J.S.Peatfield at damtp.cam.ac.uk]

Our (very old) HPs arn't on maintenence any more so we can only apply
security patches....  [At least that is what HP told us].  Oddly the
compilers we have was installed from the last CDs they shipped us in
November 1999, which is more recent than 2.5 years ago so I wonder why
that patch wasn't already applied... :-)

 -- Jon