XXX Remove nawk(1)

@@ -91,11 +91,11 @@
 
 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"
+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"