Fix missing platform.hpp in zmq_connecter.cpp

Missed testing on Win32
Signed-off-by: Martin Lucina <mato@kotelna.sk>

src/zmq_connecter.cpp

@@ -19,6 +19,7 @@
 
 #include <new>
 
+#include "platform.hpp"
 #if defined ZMQ_HAVE_WINDOWS
 #include "windows.hpp"
 #else