build: update gnulib and autoconf submodules to latest

diff --git a/gnulib b/gnulib
index eff4c0360a0de49d22629d3bdbd15460c0615cee..44c4f75581a7774594e5a225ab43c9c211e4abb4 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit eff4c0360a0de49d22629d3bdbd15460c0615cee
+Subproject commit 44c4f75581a7774594e5a225ab43c9c211e4abb4

diff --git a/submodules/autoconf b/submodules/autoconf
index 8cb01740a0b7044feafcc51ea980583311e52a99..f4be358c2b97736cda5a0d543fa3d34d3cde40bd 160000 (submodule)
--- a/submodules/autoconf
+++ b/submodules/autoconf
@@ -1 +1 @@
-Subproject commit 8cb01740a0b7044feafcc51ea980583311e52a99
+Subproject commit f4be358c2b97736cda5a0d543fa3d34d3cde40bd