REORG: include: move listener.h to haproxy/listener{,-t}.h

stdlib and list were missing from listener.h, otherwise it was OK.
diff --git a/src/proto_uxst.c b/src/proto_uxst.c
index a3eefa9..f0a38e7 100644
--- a/src/proto_uxst.c
+++ b/src/proto_uxst.c
@@ -29,6 +29,7 @@
 #include <haproxy/api.h>
 #include <haproxy/errors.h>
 #include <haproxy/list.h>
+#include <haproxy/listener.h>
 #include <haproxy/tools.h>
 #include <haproxy/time.h>
 #include <haproxy/version.h>
@@ -37,7 +38,6 @@
 
 #include <proto/connection.h>
 #include <haproxy/fd.h>
-#include <proto/listener.h>
 #include <proto/log.h>
 #include <haproxy/protocol.h>
 #include <proto/task.h>