BUILD: connection: connection.h needs list.h and server.h

It manipulates lists and calls srv_add_conn().

include/haproxy/connection.h

@@ -29,9 +29,11 @@
 #include <haproxy/connection-t.h>
 #include <haproxy/fd.h>
 #include <haproxy/http_ana.h>
+#include <haproxy/list.h>
 #include <haproxy/listener-t.h>
 #include <haproxy/obj_type.h>
 #include <haproxy/pool.h>
+#include <haproxy/server.h>
 #include <haproxy/session.h>
 #include <haproxy/task-t.h>
 #include <haproxy/tcpcheck-t.h>