Fix sys.flags to properly expose bytes_warning.

Closes issue #2790.

Lib/test/test_sys.py

@@ -357,7 +357,7 @@ class SysModuleTest(unittest.TestCase):
         attrs = ("debug", "py3k_warning", "division_warning", "division_new",
                  "inspect", "interactive", "optimize", "dont_write_bytecode",
                  "no_site", "ignore_environment", "tabcheck", "verbose",
-                 "unicode")
+                 "unicode", "bytes_warning")
         for attr in attrs:
             self.assert_(hasattr(sys.flags, attr), attr)
             self.assertEqual(type(getattr(sys.flags, attr)), int, attr)

Python/sysmodule.c

@@ -1178,9 +1178,9 @@ static PyStructSequence_Desc flags_desc = {
 	flags__doc__,	/* doc */
 	flags_fields,	/* fields */
 #ifdef RISCOS
-	15
+	16
 #else
-	14
+	15
 #endif
 };