net/libvncserver: Fix build

PR:		269039
Reported by:	VVD <vvd@unislabs.com>

net/libvncserver/files/patch-client__examples_sshtunnel.c

@@ -0,0 +1,12 @@
+--- client_examples/sshtunnel.c.orig	2023-01-18 22:59:01 UTC
++++ client_examples/sshtunnel.c
+@@ -16,6 +16,9 @@
+ #include <netdb.h>
+ #include <signal.h>
+ #include <errno.h>
++#ifdef __FreeBSD__
++#include <sys/socket.h>
++#endif
+ 
+ /* The one global bool that's global so we can set it via
+    a signal handler... */