build: autoconf: update.

[bison.git] / submodules / autoconf

diff --git a/submodules/autoconf b/submodules/autoconf
index f4be358c2b97736cda5a0d543fa3d34d3cde40bd..0db9c1a19fbbdbf8728ec8d9c5a020d070ec23b2 160000 (submodule)
--- a/submodules/autoconf
+++ b/submodules/autoconf
@@ -1 +1 @@
-Subproject commit f4be358c2b97736cda5a0d543fa3d34d3cde40bd
+Subproject commit 0db9c1a19fbbdbf8728ec8d9c5a020d070ec23b2