[m4-common] Update autoconf-archive

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 51cfce5b891246ab4b06c66cde6f43acbeea1ef8
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sat Dec 17 09:10:50 2016 -0600

    Update autoconf-archive
    
    This pulls in a small fix for AX_GENERATE_CHANGELOG:
    
    http://git.savannah.gnu.org/cgit/autoconf-archive.git/commit/?id=1dd56cc4748ef2cbf415760287481bf89c5821da

 autoconf-archive |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/autoconf-archive b/autoconf-archive
index b5f2316..b59fda6 160000
--- a/autoconf-archive
+++ b/autoconf-archive
@@ -1 +1 @@
-Subproject commit b5f23160e050fac2d7ff78bfd76e5116fc179f64
+Subproject commit b59fda6fb328dcdf01402e5cd45311c0f93cd259