posix: upgrade libevent from 1.4.7 to 1.4.13

third_party/libevent/evhttp.h

Index: third_party/libevent/evhttp.h
diff --git a/third_party/libevent/evhttp.h b/third_party/libevent/evhttp.h
index 0d35f9e0614f1327c94d279411b51f6ed9b2f077..99d16a2f47ab525f20ba9a5be820b6ab29122aba 100644
--- a/third_party/libevent/evhttp.h
+++ b/third_party/libevent/evhttp.h
@@ -267,6 +267,10 @@ void evhttp_connection_free(struct evhttp_connection *evcon);
 void evhttp_connection_set_local_address(struct evhttp_connection *evcon,
     const char *address);
 
+/** sets the local port from which http connections are made */
+void evhttp_connection_set_local_port(struct evhttp_connection *evcon,
+    unsigned short port);
+
 /** Sets the timeout for events related to this connection */
 void evhttp_connection_set_timeout(struct evhttp_connection *evcon,
     int timeout_in_secs);
@@ -331,10 +335,20 @@ char *evhttp_decode_uri(const char *uri);
 
 /**
  * Helper function to parse out arguments in a query.
- * The arguments are separated by key and value.
- * URI should already be decoded.
+ *
+ * Parsing a uri like
+ *
+ *    http://foo.com/?q=test&s=some+thing
+ *
+ * will result in two entries in the key value queue.
+
+ * The first entry is: key="q", value="test"
+ * The second entry is: key="s", value="some thing"
+ *
+ * @param uri the request URI
+ * @param headers the head of the evkeyval queue
  */
-void evhttp_parse_query(const char *uri, struct evkeyvalq *);
+void evhttp_parse_query(const char *uri, struct evkeyvalq *headers);
 
 
 /**