add hashing to event header lookup

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@10227 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_event.h

@@ -67,6 +67,8 @@ SWITCH_BEGIN_EXTERN_C
 	char *name;
 	/*! the header value */
 	char *value;
+	/*! hash of the header name */
+	unsigned long hash;
 	struct switch_event_header *next;
 };