TESTrun: put white space between flags.

I guess that's not allowed, at least not by fc.
diff --git a/tests/TESTrun b/tests/TESTrun
index 8a207f3..e43e760 100755
--- a/tests/TESTrun
+++ b/tests/TESTrun
@@ -137,7 +137,7 @@
         #
         if ($^O eq 'MSWin32') {
             my $winoutput = File::Spec->canonpath($output);
-            $r = system "fc/lb1000/t/1 $winoutput tests\\NEW\\$outputbase >tests\\DIFF\\$outputbase.diff";
+            $r = system "fc /lb1000 /t /1 $winoutput tests\\NEW\\$outputbase >tests\\DIFF\\$outputbase.diff";
         } else {
             $r = system "diff $output tests/NEW/$outputbase >tests/DIFF/$outputbase.diff";
         }
@@ -169,7 +169,7 @@
         if ($^O eq 'MSWin32') {
             my $winoutput = File::Spec->canonpath($output);
             my $canonstderrlog = File::Spec->canonpath($stderrlog);
-            $nr = system "fc/lb1000/t/1 $winoutput.stderr $canonstderrlog >tests\DIFF\$outputbase.stderr.diff";
+            $nr = system "fc /lb1000 /t /1 $winoutput.stderr $canonstderrlog >tests\DIFF\$outputbase.stderr.diff";
         } else {
             $nr = system "diff $output.stderr $stderrlog >tests/DIFF/$outputbase.stderr.diff";
         }