Update gnulib

Closes #653 (printf %n crashes on Android)

Signed-off-by: Tim Rühsen <tim.ruehsen@gmx.de>

diff --git a/gnulib b/gnulib
index 4652c7bafa60332145f1e05a7de5f48e1bc56226..6c0f109fb98501fc8d65ea2c83501b45a80b00ab 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 4652c7bafa60332145f1e05a7de5f48e1bc56226
+Subproject commit 6c0f109fb98501fc8d65ea2c83501b45a80b00ab