Don't do pg_ctl logrotate test on Windows

The test crashes and burns quite badly, for some reason, but even if it
didn't it wouldn't work, since Windows doesn't let you rename a file
held by a running process.

src/bin/pg_ctl/t/004_logrotate.pl

@@ -6,6 +6,17 @@ use TestLib;
 use Test::More tests => 1;
 use Time::HiRes qw(usleep);
 
+if ($windows_os)
+{
+	plan skip_all => 'logrotate test not supported on Windows';
+	exit;
+}
+else
+{
+	plan tests => 1;
+}
+
+
 my $tempdir = TestLib::tempdir;
 
 my $node = get_new_node('primary');