upstream: Use awk instead of cut to help -portable.

Some platforms have size limits on cut.

OpenBSD-Regress-ID: fe871e8ed43fd92efb0df76f61c5cc9c5429ea82

Author: daztucker

regress/sshsig.sh

@@ -1,4 +1,4 @@
-#	$OpenBSD: sshsig.sh,v 1.16 2025/09/11 07:23:32 djm Exp $
+#	$OpenBSD: sshsig.sh,v 1.17 2026/06/16 10:58:42 dtucker Exp $
 #	Placed in the Public Domain.
 
 tid="sshsig"
@@ -86,10 +86,10 @@ for t in $SIGNKEYS; do
 	 cat $pubkey) > $OBJ/allowed_signers
 	${SSHKEYGEN} -q -Y verify -s $sigfile -n $sig_namespace \
 		-I $sig_principal -f $OBJ/allowed_signers \
-		-O print-pubkey \
-		< $DATA | cut -d' ' -f1-2 > ${OBJ}/${keybase}-fromsig.pub || \
+		-O print-pubkey < $DATA | \
+		awk '{print $1" "$2}' >${OBJ}/${keybase}-fromsig.pub || \
 		fail "failed signature for $t key w/ print-pubkey"
-	cut -d' ' -f1-2 ${OBJ}/${keybase}.pub > ${OBJ}/${keybase}-strip.pub
+	awk '{print $1" "$2}' ${OBJ}/${keybase}.pub >${OBJ}/${keybase}-strip.pub
 	diff -r ${OBJ}/${keybase}-strip.pub ${OBJ}/${keybase}-fromsig.pub || \
 		fail "print-pubkey differs from signature key"