Contribs: fix libupnp build under mingw32 with ipv6 enabled.

contrib/src/upnp/libupnp-ipv6.patch

+From 438ace99538713fb1370411188e0f370069a1818 Mon Sep 17 00:00:00 2001
+From: Konstantin Pavlov <thresh@videolan.org>
+Date: Tue, 29 May 2012 10:18:40 +0400
+Subject: [PATCH] Fix compile under mingw with IPv6 enabled.
+
+---
+ upnp/src/genlib/miniserver/miniserver.c |    7 +++++++
+ upnp/src/ssdp/ssdp_server.c             |    7 +++++++
+ 2 files changed, 14 insertions(+)
+
+diff --git a/upnp/src/genlib/miniserver/miniserver.c b/upnp/src/genlib/miniserver/miniserver.c
+index af310ca..1ae422f 100644
+--- a/upnp/src/genlib/miniserver/miniserver.c
++++ b/upnp/src/genlib/miniserver/miniserver.c
+@@ -68,6 +68,13 @@
+ /*! . */
+ #define APPLICATION_LISTENING_PORT 49152
+ 
++/* IPV6_V6ONLY is missing from MinGW, hack taken from
++ * http://svn.apache.org/repos/asf/apr/apr/trunk/network_io/win32/sockopt.c
++ */
++#ifndef IPV6_V6ONLY
++#define IPV6_V6ONLY 27
++#endif
++
+ struct mserv_request_t {
+ 	/*! Connection handle. */
+ 	SOCKET connfd;
+diff --git a/upnp/src/ssdp/ssdp_server.c b/upnp/src/ssdp/ssdp_server.c
+index 231c2c5..6a9c27f 100644
+--- a/upnp/src/ssdp/ssdp_server.c
++++ b/upnp/src/ssdp/ssdp_server.c
+@@ -69,6 +69,13 @@
+ 	#endif /* UPNP_ENABLE_IPV6 */
+ #endif /* INCLUDE_CLIENT_APIS */
+ 
++/* IPV6_V6ONLY is missing from MinGW, hack taken from
++ * http://svn.apache.org/repos/asf/apr/apr/trunk/network_io/win32/sockopt.c
++ */
++#ifndef IPV6_V6ONLY
++#define IPV6_V6ONLY 27
++#endif
++
+ void RequestHandler();
+ 
+ enum Listener {
+-- 
+1.7.9.7
+

contrib/src/upnp/rules.mak

@@ -21,6 +21,7 @@ ifdef HAVE_WIN32
 	$(APPLY) $(SRC)/upnp/libupnp-win32.patch
 	$(APPLY) $(SRC)/upnp/libupnp-win64.patch
 endif
+	$(APPLY) $(SRC)/upnp/libupnp-ipv6.patch
 	$(UPDATE_AUTOCONFIG) && cd $(UNPACK_DIR) && mv config.guess config.sub build-aux/
 	$(MOVE)