Update copyright dates with scripts/update-copyrights

I used these shell commands:

../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")

and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master

6 files changed, 6 insertions, 6 deletions

diff --git a/nss/nss_db/db-XXX.c b/nss/nss_db/db-XXX.c
index 7994711e56..5434524fff 100644
--- a/nss/nss_db/db-XXX.c
+++ b/nss/nss_db/db-XXX.c
@@ -1,5 +1,5 @@
 /* Common code for DB-based databases in nss_db module.
-   Copyright (C) 1996-2020 Free Software Foundation, Inc.
+   Copyright (C) 1996-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/nss/nss_db/db-init.c b/nss/nss_db/db-init.c
index 6f48b821f3..e2071d0d60 100644
--- a/nss/nss_db/db-init.c
+++ b/nss/nss_db/db-init.c
@@ -1,5 +1,5 @@
 /* Initialization in nss_db module.
-   Copyright (C) 2011-2020 Free Software Foundation, Inc.
+   Copyright (C) 2011-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/nss/nss_db/db-initgroups.c b/nss/nss_db/db-initgroups.c
index a8c39d68d9..f09059bc41 100644
--- a/nss/nss_db/db-initgroups.c
+++ b/nss/nss_db/db-initgroups.c
@@ -1,5 +1,5 @@
 /* Initgroups handling in nss_db module.
-   Copyright (C) 2011-2020 Free Software Foundation, Inc.
+   Copyright (C) 2011-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@gmail.com>.
 
diff --git a/nss/nss_db/db-netgrp.c b/nss/nss_db/db-netgrp.c
index 53eb9de872..436cafce42 100644
--- a/nss/nss_db/db-netgrp.c
+++ b/nss/nss_db/db-netgrp.c
@@ -1,5 +1,5 @@
 /* Netgroup file parser in nss_db modules.
-   Copyright (C) 1996-2020 Free Software Foundation, Inc.
+   Copyright (C) 1996-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
diff --git a/nss/nss_db/db-open.c b/nss/nss_db/db-open.c
index f5e92ed5ac..35b7e4e991 100644
--- a/nss/nss_db/db-open.c
+++ b/nss/nss_db/db-open.c
@@ -1,5 +1,5 @@
 /* Common database routines for nss_db.
-   Copyright (C) 2000-2020 Free Software Foundation, Inc.
+   Copyright (C) 2000-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
diff --git a/nss/nss_db/nss_db.h b/nss/nss_db/nss_db.h
index e354909c58..7067b1bdd4 100644
--- a/nss/nss_db/nss_db.h
+++ b/nss/nss_db/nss_db.h
@@ -1,5 +1,5 @@
 /* Common database open/close routines for nss_db.
-   Copyright (C) 1999-2020 Free Software Foundation, Inc.
+   Copyright (C) 1999-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or