csplit: update gnulib for Solaris 8,9 snprintf fix

diff --git a/gnulib b/gnulib
index d534aa814510c8cd4ac70ffee3e0abd58daba356..fe2a2304a8635cdaabe93e4f5e49960bec1512b1 160000 (submodule)
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit d534aa814510c8cd4ac70ffee3e0abd58daba356
+Subproject commit fe2a2304a8635cdaabe93e4f5e49960bec1512b1