[m4-common] Update autoconf-archive to v2018.03.13

[Sébastien Wilmet <swilmet src gnome org>]

commit c4a44407abaf673067f7337af11457d5c2c318ff
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Apr 8 19:08:32 2018 +0200

    Update autoconf-archive to v2018.03.13

 autoconf-archive |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/autoconf-archive b/autoconf-archive
index b4488ed..ab7d6c3 160000
--- a/autoconf-archive
+++ b/autoconf-archive
@@ -1 +1 @@
-Subproject commit b4488ed1f9e976984d60239b10c1d16728586f38
+Subproject commit ab7d6c3b2d2021802d846191939bd0e8bad93318