event hook added.

parser/msg_parser.h

@@ -78,6 +78,7 @@ struct sip_msg {
 	struct hdr_field* proxy_require;
 	struct hdr_field* unsupported;
 	struct hdr_field* allow;
+	struct hdr_field* event;
 
 	char* eoh;        /* pointer to the end of header (if found) or null */
 	char* unparsed;   /* here we stopped parsing*/