BUILD: hlua: needs to include stream-t.h

It uses the SF_ERR_* error codes and currently gets them via
intermediary includes.
diff --git a/src/hlua_fcn.c b/src/hlua_fcn.c
index f7120f2..56923f0 100644
--- a/src/hlua_fcn.c
+++ b/src/hlua_fcn.c
@@ -32,6 +32,7 @@
 #include <haproxy/server.h>
 #include <haproxy/stats.h>
 #include <haproxy/stick_table.h>
+#include <haproxy/stream-t.h>
 #include <haproxy/time.h>
 #include <haproxy/tools.h>