XXX Remove nawk(1)

*** 91,101 ****
  
  x="/usr/bin/awk"
  [[ "$(cat "$x" | /usr/bin/sum)" == "$(cat "$x" | sum)" ]]       || err_exit "pipe: /usr/bin/sum $x != sum $x"
  [[ "$(/usr/bin/sum "$x")" == "$(sum "$x")" ]]                   || err_exit "file: /usr/bin/sum $x != sum $x"
  
! x="/usr/bin/nawk"
  [[ "$(cat "$x" | /usr/bin/sum)" == "$(cat "$x" | sum)" ]]       || err_exit "pipe: /usr/bin/sum $x != sum $x"
  [[ "$(/usr/bin/sum "$x")" == "$(sum "$x")" ]]                   || err_exit "file: /usr/bin/sum $x != sum $x"
  
  x="/usr/bin/ksh"
  [[ "$(cat "$x" | /usr/bin/sum)" == "$(cat "$x" | sum)" ]]       || err_exit "pipe: /usr/bin/sum $x != sum $x"
--- 91,101 ----
  
  x="/usr/bin/awk"
  [[ "$(cat "$x" | /usr/bin/sum)" == "$(cat "$x" | sum)" ]]       || err_exit "pipe: /usr/bin/sum $x != sum $x"
  [[ "$(/usr/bin/sum "$x")" == "$(sum "$x")" ]]                   || err_exit "file: /usr/bin/sum $x != sum $x"
  
! x="/usr/xpg4/bin/awk"
  [[ "$(cat "$x" | /usr/bin/sum)" == "$(cat "$x" | sum)" ]]       || err_exit "pipe: /usr/bin/sum $x != sum $x"
  [[ "$(/usr/bin/sum "$x")" == "$(sum "$x")" ]]                   || err_exit "file: /usr/bin/sum $x != sum $x"
  
  x="/usr/bin/ksh"
  [[ "$(cat "$x" | /usr/bin/sum)" == "$(cat "$x" | sum)" ]]       || err_exit "pipe: /usr/bin/sum $x != sum $x"