Don't use printf %n.

Index: glib/tests/test-printf.c
--- glib/tests/test-printf.c.orig
+++ glib/tests/test-printf.c
@@ -578,6 +578,7 @@ test_s (void)
 static void
 test_n (void)
 {
+#if 0
   gchar buf[128];
   gint res;
   gint i;
@@ -592,6 +593,7 @@ test_n (void)
   g_assert_cmpint (res, ==, 3);
   g_assert_cmpstr (buf, ==, "abc");
   g_assert_cmpint (l, ==, 3);
+#endif
 }
 
 static void