minor change to avoid compiler error in visual studio.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403750

dlib/rand/mersenne_twister.h

@@ -101,8 +101,8 @@ namespace dlib
                 std::ostream& out
             )
             {
-                serialize(item.x, out);
-                serialize(item.i, out);
+				dlib::serialize(item.x, out);
+				dlib::serialize(item.i, out);
             }
 
             friend void deserialize(
@@ -110,8 +110,8 @@ namespace dlib
                 std::istream& in 
             )
             {
-                deserialize(item.x, in);
-                deserialize(item.i, in);
+				dlib::deserialize(item.x, in);
+                dlib::deserialize(item.i, in);
             }
 
         private: