Update ignored files for the latest version of Gnulib

lib/.gitignore

@@ -31,6 +31,7 @@ Makefile.am
 /iconv_open-irix.gperf
 /iconv_open-osf.gperf
 /iconv_open-solaris.gperf
+/iconv_open-zos.gperf
 /iconv_open.c
 /limits.in.h
 /localcharset.c
@@ -50,6 +51,9 @@ Makefile.am
 /monetary.in.h
 /ref-add.sin
 /ref-del.sin
+/setlocale-lock.c
+/setlocale_null.c
+/setlocale_null.h
 /stdbool.in.h
 /stddef.in.h
 /stdint.in.h

m4/.gitignore

@@ -62,6 +62,7 @@
 /printf-posix.m4
 /progtest.m4
 /pthread_rwlock_rdlock.m4
+/setlocale_null.m4
 /size_max.m4
 /ssize_t.m4
 /stdbool.m4

m4/gnulib-cache.m4

@@ -1,4 +1,4 @@
-# Copyright (C) 2002-2019 Free Software Foundation, Inc.
+# Copyright (C) 2002-2020 Free Software Foundation, Inc.
 #
 # This file is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by