update unbound from upstream

external/unbound/util/mini_event.h

@@ -58,6 +58,21 @@
 #define HAVE_EVENT_BASE_FREE
 #endif 
 
+/* redefine to use our own namespace so that on platforms where
+ * linkers crosslink library-private symbols with other symbols, it works */
+#define event_init minievent_init
+#define event_get_version minievent_get_version
+#define event_get_method minievent_get_method
+#define event_base_dispatch minievent_base_dispatch
+#define event_base_loopexit minievent_base_loopexit
+#define event_base_free minievent_base_free
+#define event_set minievent_set
+#define event_base_set minievent_base_set
+#define event_add minievent_add
+#define event_del minievent_del
+#define signal_add minisignal_add
+#define signal_del minisignal_del
+
 /** event timeout */
 #define EV_TIMEOUT	0x01
 /** event fd readable */