Decrease compiler version where _WIN32_WINNT macro set to 0x600, so our MSVC2013 builds have acces to Vista locale functions

Author: vbwagner

src/include/port/win32.h

@@ -9,7 +9,7 @@
  * Also for VS2015, add a define that stops compiler complaints about
  * using the old Winsock API.
  */
-#if defined(_MSC_VER) && _MSC_VER >= 1900
+#if defined(_MSC_VER) && _MSC_VER >= 1800
 #define  _WINSOCK_DEPRECATED_NO_WARNINGS
 #define MIN_WINNT 0x0600
 #else