define guards to prevent warnings

code/qcommon/net_ip.c

@@ -46,10 +46,22 @@ typedef int socklen_t;
 typedef unsigned short sa_family_t;
 #	endif
 
-#	define EAGAIN					WSAEWOULDBLOCK
-#	define EADDRNOTAVAIL	WSAEADDRNOTAVAIL
-#	define EAFNOSUPPORT		WSAEAFNOSUPPORT
-#	define ECONNRESET			WSAECONNRESET
+#	ifndef EAGAIN
+#		define EAGAIN					WSAEWOULDBLOCK
+#	endif
+
+#	ifndef EADDRNOTAVAIL
+#		define EADDRNOTAVAIL	WSAEADDRNOTAVAIL
+#	endif
+
+#	ifndef EAFNOSUPPORT
+#		define EAFNOSUPPORT		WSAEAFNOSUPPORT
+#	endif
+
+#	ifndef ECONNRESET
+#		define ECONNRESET			WSAECONNRESET
+#	endif
+
 typedef u_long	ioctlarg_t;
 #	define socketError		WSAGetLastError( )