^Z can't suspend less in the tty mode

[Kazuhiro Fujieda]

This is a long standing problem. ^Z can't suspend the `less'
command in the tty mode. As far as I can track down the strace
log, it seems to be suspended but wake up immediately after that.
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  | AIST      Kazuhiro Fujieda <fujieda@jaist.ac.jp>
  | HOKURIKU  School of Information Science
o_/ 1990      Japan Advanced Institute of Science and Technology