Try to add windows tcpip headers

Author: proller

include/enet/win32.h

@@ -14,6 +14,17 @@
 #endif
 #endif
 
+
+#ifndef WIN32_LEAN_AND_MEAN
+	#define WIN32_LEAN_AND_MEAN
+#endif
+#ifndef _WIN32_WINNT
+	#define _WIN32_WINNT 0x0501
+#endif
+#define NOMINMAX
+#include <windows.h>
+#include <ws2tcpip.h>
+
 #include <stdlib.h>
 #include <winsock2.h>