disable duplicate headers on request param events

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@14909 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_event.h

@@ -95,8 +95,14 @@ struct switch_event {
 	/*! unique key */
 	unsigned long key;
 	struct switch_event *next;
+	int flags;
 };
 
+typedef enum {
+	EF_UNIQ_HEADERS = (1 << 0)
+} switch_event_flag_t;
+
+
 struct switch_event_node;
 
 #define SWITCH_EVENT_SUBCLASS_ANY NULL