[PATCH] ws2_32: define IP_UNICAST_IF if not found on linux

[Maarten Lankhorst]

#define IP_UNICAST_IF 50 from linux/in.h is needed for Wine to support
binding to interfaces and support broadcast packets on that interface.

It appears that bits/in.h is manually merged with this file and that it
is inappropriate to include linux/in.h directly in user-space applications,
so define this ourselves if the headers don't define it.
    
See https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1065640

---

diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index 792ab1c..5c69d21 100644
--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -157,6 +157,9 @@
 # include "wsnwlink.h"
 #endif
 
+#if defined(linux) && !defined(IP_UNICAST_IF)
+#define IP_UNICAST_IF 50
+#endif
 
 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)  || defined(__DragonFly__)
 # define sipx_network    sipx_addr.x_net