Update on the gnulib stable-202201 branch, for compatibility with Autoconf 2.73.

diff --git a/gnulib b/gnulib
index 9824c34ff9e4fc960157cdd016135571084a2abe..39da61d3c3fb1774295705295c72d73a53dce9b1 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 9824c34ff9e4fc960157cdd016135571084a2abe
+Subproject commit 39da61d3c3fb1774295705295c72d73a53dce9b1