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

7 files changed, 7 insertions, 7 deletions

diff --git a/sysdeps/ia64/nptl/Makefile b/sysdeps/ia64/nptl/Makefile
index d34cb27699..d8a8fc44fe 100644
--- a/sysdeps/ia64/nptl/Makefile
+++ b/sysdeps/ia64/nptl/Makefile
@@ -1,4 +1,4 @@
-# Copyright (C) 2003-2020 Free Software Foundation, Inc.
+# Copyright (C) 2003-2021 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/sysdeps/ia64/nptl/bits/struct_rwlock.h b/sysdeps/ia64/nptl/bits/struct_rwlock.h
index 2aeb5d4ca8..bb8adf7201 100644
--- a/sysdeps/ia64/nptl/bits/struct_rwlock.h
+++ b/sysdeps/ia64/nptl/bits/struct_rwlock.h
@@ -1,5 +1,5 @@
 /* IA64 internal rwlock struct definitions.
-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
 
    This file is part of the GNU C Library.
 
diff --git a/sysdeps/ia64/nptl/pthread_spin_lock.c b/sysdeps/ia64/nptl/pthread_spin_lock.c
index c2ba35c837..87eebc7fe9 100644
--- a/sysdeps/ia64/nptl/pthread_spin_lock.c
+++ b/sysdeps/ia64/nptl/pthread_spin_lock.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+/* Copyright (C) 2003-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
 
diff --git a/sysdeps/ia64/nptl/pthread_spin_trylock.c b/sysdeps/ia64/nptl/pthread_spin_trylock.c
index bf0d61cb98..c0dd8dafdc 100644
--- a/sysdeps/ia64/nptl/pthread_spin_trylock.c
+++ b/sysdeps/ia64/nptl/pthread_spin_trylock.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+/* Copyright (C) 2003-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
 
diff --git a/sysdeps/ia64/nptl/pthread_spin_unlock.c b/sysdeps/ia64/nptl/pthread_spin_unlock.c
index c136307d49..d869ef23a6 100644
--- a/sysdeps/ia64/nptl/pthread_spin_unlock.c
+++ b/sysdeps/ia64/nptl/pthread_spin_unlock.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+/* Copyright (C) 2003-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
 
diff --git a/sysdeps/ia64/nptl/pthreaddef.h b/sysdeps/ia64/nptl/pthreaddef.h
index 26c509abe2..3a0f6daf9a 100644
--- a/sysdeps/ia64/nptl/pthreaddef.h
+++ b/sysdeps/ia64/nptl/pthreaddef.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2003-2020 Free Software Foundation, Inc.
+/* Copyright (C) 2003-2021 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/sysdeps/ia64/nptl/tls.h b/sysdeps/ia64/nptl/tls.h
index 42b082dad6..66d9bf3189 100644
--- a/sysdeps/ia64/nptl/tls.h
+++ b/sysdeps/ia64/nptl/tls.h
@@ -1,5 +1,5 @@
 /* Definition for thread-local data handling.  nptl/IA-64 version.
-   Copyright (C) 2003-2020 Free Software Foundation, Inc.
+   Copyright (C) 2003-2021 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