tests: md5sum: fix false failures on cygwin

* tests/misc/md5sum-newline.pl: Avoid binary '*' tags when
comparing checksums.
* tests/misc/md5sum-bsd.sh: Avoid binary '*' tags so that we correctly
trigger the ambiguity test.
Reported by Bruno Haible

tests/misc/md5sum-bsd.sh

@@ -28,7 +28,7 @@ print_ver_ md5sum
 # I.e., one not starting with ' ' or '*'
 for i in 'a' ' b' '*c' 'dd' ' '; do
   echo "$i" > "$i"
-  md5sum "$i" >> check.md5sum || fail=1
+  md5sum --text "$i" >> check.md5sum || fail=1
 done
 sed 's/  / /' check.md5sum > check.md5
 

tests/misc/md5sum-newline.pl

@@ -35,7 +35,7 @@ my $z = '--zero';
 my @Tests =
     (
      ['newline', $t, {IN=> {"a\nb"=> ''}}, {OUT=>"\\$degenerate  a\\nb\n"}],
-     ['zero', $z, {IN=> {"a\nb"=> ''}}, {OUT=>"$degenerate  a\nb\0"}],
+     ['zero', "$t $z", {IN=> {"a\nb"=> ''}}, {OUT=>"$degenerate  a\nb\0"}],
     );
 
 my $save_temps = $ENV{DEBUG};