Really fix setmode this time

Thanks to Khaled for spotting it.

util/options.cc

diff --git a/util/options.cc b/util/options.cc
index 57531d5..bd4d55e 100644
--- a/util/options.cc
+++ b/util/options.cc
@@ -558,7 +558,7 @@
     fp = fopen (output_file, "wb");
   else {
 #ifdef HAVE_SETMODE
-    _setmode (fileno (stdout), _O_BINARY);
+    setmode (fileno (stdout), _O_BINARY);
 #endif
     fp = stdout;
   }