fix cds test

- use $PERL instead of perl
- use $DIFF instead of cmp for windows portability; cmp doesn't
  handle CR characters properly

bin/tests/system/cds/checktime.pl

@@ -9,13 +9,17 @@
 # See the COPYRIGHT file distributed with this work for additional
 # information regarding copyright ownership.
 
-$target = shift;
+use strict;
+use warnings;
+
+my $target = shift;
+my $notbefore;
+my $inception;
 while (<>) {
-	$notbefore = $1 if m{^.* must not be signed before \d+ [(](\d+)[)]$};
-	$inception = $1 if m{^.* inception time \d+ [(](\d+)[)]$};
+	$notbefore = $1 if m{^.* must not be signed before \d+ [(](\d+)[)]};
+	$inception = $1 if m{^.* inception time \d+ [(](\d+)[)]};
 }
 die "missing notbefore time" unless $notbefore;
 die "missing inception time" unless $inception;
 my $delta = $inception - $notbefore;
-die "bad inception time $delta"
-	unless abs($delta - $target) < 3;
+die "bad inception time $delta" unless abs($delta - $target) < 3;

bin/tests/system/cds/setup.sh

@@ -38,7 +38,7 @@ id2=$id2
 EOF
 
 tac() {
-	perl -e 'print reverse <>' "$@"
+	$PERL -e 'print reverse <>' "$@"
 }
 
 convert() {

bin/tests/system/cds/tests.sh

@@ -51,7 +51,7 @@ check_stderr() {
 }
 
 check_stdout() {
-	cmp out.$n "${out:-empty}" >/dev/null && return
+	$DIFF out.$n "${out:-empty}" >/dev/null && return
 	echo_d "stdout did not match '$out'"
 	(	echo "wanted"
 		cat "$out"
@@ -127,10 +127,10 @@ name='in-place backup correct modification time'
 testcase 0 $PERL checkmtime.pl 7200 DS.inplace.bak
 
 name='in-place correct output'
-testcase 0 cmp DS.1 DS.inplace
+testcase 0 $DIFF DS.1 DS.inplace
 
 name='in-place backup unmodified'
-testcase 0 cmp DS.1 DS.inplace.bak
+testcase 0 $DIFF DS.1 DS.inplace.bak
 
 name='one mangled DS'
 err='found RRSIG by key'