Don't define Sniffer callback traits when using VS.

include/tins/internals.h

@@ -205,7 +205,7 @@ struct is_unsigned_integral<uint64_t> {
     static const bool value = true;
 };
 
-#if TINS_IS_CXX11
+#if TINS_IS_CXX11 && !defined(_MSC_VER)
 
 // Template metaprogramming trait to determine if a functor can accept another parameter as an argument
 template <class T, class P, class=void>

include/tins/sniffer.h

@@ -582,7 +582,7 @@ namespace Tins {
         for(iterator it = begin(); it != end(); ++it) {
             try {
                 // If the functor returns false, we're done
-                #if TINS_IS_CXX11
+                #if TINS_IS_CXX11 && !defined(_MSC_VER)
                 if (!Tins::Internals::invoke_loop_cb(function, *it))
                     return;
                 #else