[m4-common] Revert "Update autoconf-archive to v2019.01.06"

[Emmanuele Bassi <ebassi src gnome org>]

commit a7cc25124ed744eeb1d833b35b5770fb0edee199
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Fri Jan 11 18:55:44 2019 +0000

    Revert "Update autoconf-archive to v2019.01.06"
    
    This reverts commit c25f1e8d86abb1f472e09cd18f7527294234502e.
    
    There's a cascade of dependencies introduced by this update that cannot
    be resolved in a way that doesn't make the existence of m4-common moot.

 autoconf-archive | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/autoconf-archive b/autoconf-archive
index 37e48b7..ab7d6c3 160000
--- a/autoconf-archive
+++ b/autoconf-archive
@@ -1 +1 @@
-Subproject commit 37e48b795e42c9e9ccb6ce6819e65ed9d9d0fc56
+Subproject commit ab7d6c3b2d2021802d846191939bd0e8bad93318