winsock.h: define ip_mreq

[Felix Nawothnig]

ChangeLog:
- Define ip_mreq

Index: winsock.h
===================================================================
RCS file: /home/wine/wine/include/winsock.h,v
retrieving revision 1.63
diff -u -r1.63 winsock.h
--- winsock.h	28 Feb 2004 01:49:37 -0000	1.63
+++ winsock.h	25 Mar 2004 13:56:34 -0000
@@ -592,6 +592,15 @@
     char               sin_zero[8];
 } SOCKADDR_IN, *PSOCKADDR_IN, *LPSOCKADDR_IN;
 
+/*
+ * Multicast group information
+ */
+
+struct WS(ip_mreq)
+{
+    struct WS(in_addr) imr_multiaddr;
+    struct WS(in_addr) imr_interface;
+};
 
 /*
  * WSAStartup