build: fix regression in large file support

* .gnulib: Update to latest, for largefile fix.

diff --git a/.gnulib b/.gnulib
index 7f494c7d725db4a7f3abdef09d4070725487da67..4470580881a7b821b52fb5635102ef3e27aa5af4 160000 (submodule)
--- a/.gnulib
+++ b/.gnulib
@@ -1 +1 @@
-Subproject commit 7f494c7d725db4a7f3abdef09d4070725487da67
+Subproject commit 4470580881a7b821b52fb5635102ef3e27aa5af4