build: update gnulib to latest

diff --git a/gnulib b/gnulib
index b9d0b50f6cd122a1748e1e5b79ecca7a0fef214e..ec26e3bba00b6b9083401867a36a9aee2e055f63 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit b9d0b50f6cd122a1748e1e5b79ecca7a0fef214e
+Subproject commit ec26e3bba00b6b9083401867a36a9aee2e055f63