Add a patch to make the invocation of select(2) work in CEPoll::wait() method.

Applicable only to non-Linux platforms, such as FreeBSD.

Bump PORTREVISION.

Obtained from:	https://sourceforge.net/p/udt/patches/12/

net/udt/Makefile

@@ -3,6 +3,7 @@
 
 PORTNAME=	udt
 PORTVERSION=	4.11
+PORTREVISION=	1
 CATEGORIES=	net
 MASTER_SITES=	SF
 DISTNAME=	udt.sdk.${PORTVERSION}

net/udt/files/patch-fix-select-call

@@ -0,0 +1,30 @@
+From
+	http://sourceforge.net/p/udt/patches/12/
+
+--- src/epoll.cpp
++++ src/epoll.cpp
+@@ -256,18 +256,23 @@ int CEPoll::wait(const int eid, set<UDTSOCKET>* readfds, set<UDTSOCKET>* writefd
+          FD_ZERO(&readfds);
+          FD_ZERO(&writefds);
+ 
++         //"select" needs to know the max file descriptor that is set in the fd_set structs
++         SYSSOCKET max_fd = 0;
++
+          for (set<SYSSOCKET>::const_iterator i = p->second.m_sLocals.begin(); i != p->second.m_sLocals.end(); ++ i)
+          {
+             if (lrfds)
+                FD_SET(*i, &readfds);
+             if (lwfds)
+                FD_SET(*i, &writefds);
++            if (*i > max_fd)
++               max_fd = *i;
+          }
+ 
+          timeval tv;
+          tv.tv_sec = 0;
+          tv.tv_usec = 0;
+-         if (::select(0, &readfds, &writefds, NULL, &tv) > 0)
++         if (::select(max_fd + 1, &readfds, &writefds, NULL, &tv) > 0)
+          {
+             for (set<SYSSOCKET>::const_iterator i = p->second.m_sLocals.begin(); i != p->second.m_sLocals.end(); ++ i)
+             {