Fix "xmlwf -h" output

Patch is from: http://pkgs.fedoraproject.org/cgit/expat.git/plain/expat-2.1.0-xmlwfargs.patch

--- xmlwf/xmlwf.c
+++ xmlwf/xmlwf.c
@@ -634,7 +634,7 @@ static void
 usage(const XML_Char *prog, int rc)
 {
   ftprintf(stderr,
-           T("usage: %s [-n] [-p] [-r] [-s] [-w] [-x] [-d output-dir] "
+           T("usage: %s [-s] [-n] [-p] [-x] [-w] [-d output-dir] [-c] [-m] [-r] [-t] [-v] "
              "[-e encoding] file ...\n"), prog);
   exit(rc);
 }