Fix MSVC version check -- I was given bad info.

vsprojects/config.h

@@ -9,7 +9,7 @@
 // in MSVC 2010:
 //   http://blogs.msdn.com/vcblog/archive/2009/05/25/stl-breaking-changes-in-visual-studio-2010-beta-1.aspx
 // TODO(kenton):  Use unordered_map instead, which is available in MSVC 2010.
-#if _MSC_VER < 1310 || _MSC_VER >= 1500
+#if _MSC_VER < 1310 || _MSC_VER >= 1600
 #define HASH_NAMESPACE std
 #else
 #define HASH_NAMESPACE stdext