Sync typeshed (#2684)

ambv · gvanrossum · commit add160c301fd · 2017-01-12T11:34:56.000-08:00
This is specifically against python/typeshed@4603baa as requested by @gvanrossum in python/typeshed#822 for the upcoming 0.470 release. Tests pass.
diff --git a/typeshed b/typeshed
@@ -1 +1 @@
-Subproject commit b369a3f2dbaadb5e8841d65f475a6c62659f597e
+Subproject commit 4603baaa6cd2c8c4d3a89c949d3232a17fb2c221
