test1275: remove the check of stderr

To avoid the mysterious test failures on Windows, instead rely on the
error code returned on failure.

Fixes #9716
Closes #9723

tests/data/test1275

@@ -2,6 +2,7 @@
 <info>
 <keywords>
 documentation
+markdown
 </keywords>
 </info>
 
@@ -21,10 +22,4 @@ Verify capital letters after period in markdown files
 </command>
 </client>
 
-<verify>
-<stderr>
-ok
-</stderr>
-</verify>
-
 </testcase>

tests/markdown-uppercase.pl

@@ -88,4 +88,4 @@ for my $f (@m) {
 if($errors) {
     exit 1;
 }
-print STDERR "ok\n";
+print "ok\n";