Fix error: Undefined structure 'in_addr' in Borland builds

sbbsctrl build failed, it needs another winsock header. <sigh>

Oh what a rabbit hole this has been.

src/xpdev/netwrap.h

@@ -27,6 +27,7 @@
 #include "wrapdll.h"
 
 #if defined(_WIN32)
+	#include <winsock2.h>
 	#include <ws2tcpip.h>	// struct in6_addr
 #endif