BSD build fix, you need _XOPEN_SOURCE for ipv6 defs

darcs-hash:20061003142430-16063-55bfcb0146906c929de7d35dca48f3a3a9f4869a.gz

libsofia-sip-ua-glib/su-glib/su_source.c

@@ -37,7 +37,7 @@
 #endif
 
 /* Use Posix stuff */
-#define _XOPEN_SOURCE  (500)
+#define _XOPEN_SOURCE  (600)
 
 #include <stdlib.h>
 #include <assert.h>