build: update gnulib and autoconf submodules to latest
diff --git a/gnulib b/gnulib
index 71b6037..ee27e99 160000
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 71b603702b8cf7977dedd5f6b71ea0ffc1669894
+Subproject commit ee27e996435f0daf0f8cd960285abb5859f50a4d
diff --git a/submodules/autoconf b/submodules/autoconf
index 66fdaea..2f64dcd 160000
--- a/submodules/autoconf
+++ b/submodules/autoconf
@@ -1 +1 @@
-Subproject commit 66fdaea3cfb4e758212c1891913e9a59441d49af
+Subproject commit 2f64dcd048b08bb90ec44b26f4cd6b729112a28e