[PATCH] build: update gnulib submodule to latest

[Pádraig Brady]

mainly to get updated copyright year

* doc/fdl.texi: Sync from gnulib.
* .gitignore: Add lib/unictype, as bitmap.h therein is depended on
since gnulib commit f698ea71

diff --git a/.gitignore b/.gitignore
index cda990538..5083abbbc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -108,2 +108,3 @@
 /lib/time.h
+/lib/unictype
 /lib/unistd.h
diff --git a/doc/fdl.texi b/doc/fdl.texi
index 542edaad2..eaf3da0e9 100644
--- a/doc/fdl.texi
+++ b/doc/fdl.texi
@@ -416,3 +416,3 @@ versions will be similar in spirit to the present version, 
but may
 differ in detail to address new problems or concerns.  See
-@uref{https://www.gnu.org/copyleft/}.
+@uref{https://www.gnu.org/licenses/}.

diff --git a/gnulib b/gnulib
index 972be3cee..75541c6ad 160000
--- a/gnulib
+++ b/gnulib
@@ -1 +1 @@
-Subproject commit 972be3cee24d6e9b84de7250c5bc7f078ac1a19d
+Subproject commit 75541c6adaf6fc45541a35d2c8803b9b68f2a7fc