build: use gnulib's new bootstrap_sync option.

[bison.git] / gnulib

diff --git a/gnulib b/gnulib
index 8b9b4bbba5041e107a8dea35e78d28dd3cc979f7..9aa2d4c522f12870229df0fd01d3140bddf94317 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 8b9b4bbba5041e107a8dea35e78d28dd3cc979f7
+Subproject commit 9aa2d4c522f12870229df0fd01d3140bddf94317