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/conform/Makefile b/conform/Makefile
index 015037f267..c64a83a905 100644
--- a/conform/Makefile
+++ b/conform/Makefile
@@ -1,4 +1,4 @@
-# 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
diff --git a/conform/check-header-lists.sh b/conform/check-header-lists.sh
index 2019622ecc..5497bfdf41 100755
--- a/conform/check-header-lists.sh
+++ b/conform/check-header-lists.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 # Check the set of headers with conformtest expectations for a given standard.
-# Copyright (C) 2014-2020 Free Software Foundation, Inc.
+# Copyright (C) 2014-2021 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/conform/conformtest.py b/conform/conformtest.py
index cb2bd97eca..f0405b7186 100644
--- a/conform/conformtest.py
+++ b/conform/conformtest.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Check header contents against the given standard.
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 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/conform/glibcconform.py b/conform/glibcconform.py
index 1440dedc83..7990e12799 100644
--- a/conform/glibcconform.py
+++ b/conform/glibcconform.py
@@ -1,6 +1,6 @@
 #!/usr/bin/python3
 # Shared code for glibc conformance tests.
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 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/conform/linknamespace.py b/conform/linknamespace.py
index 1d27e4cfba..66b16e244a 100644
--- a/conform/linknamespace.py
+++ b/conform/linknamespace.py
@@ -2,7 +2,7 @@
 # Check that use of symbols declared in a given header does not result
 # in any symbols being brought in that are not reserved with external
 # linkage for the given standard.
-# Copyright (C) 2014-2020 Free Software Foundation, Inc.
+# Copyright (C) 2014-2021 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/conform/list-header-symbols.py b/conform/list-header-symbols.py
index bfa463a303..ba6de25472 100644
--- a/conform/list-header-symbols.py
+++ b/conform/list-header-symbols.py
@@ -1,7 +1,7 @@
 #!/usr/bin/python3
 # Print a list of symbols exported by some headers that would
 # otherwise be in the user's namespace.
-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 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