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

8 files changed, 8 insertions, 8 deletions

diff --git a/posix/bits/cpu-set.h b/posix/bits/cpu-set.h
index 427a599..9a7e559 100644
--- a/posix/bits/cpu-set.h
+++ b/posix/bits/cpu-set.h
@@ -1,6 +1,6 @@
 /* Definition of the cpu_set_t structure used by the POSIX 1003.1b-1993
    scheduling interface.
-   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/posix/bits/getopt_core.h b/posix/bits/getopt_core.h
index bbc0f78..1751a20 100644
--- a/posix/bits/getopt_core.h
+++ b/posix/bits/getopt_core.h
@@ -1,5 +1,5 @@
 /* Declarations for getopt (basic, portable features only).
-   Copyright (C) 1989-2020 Free Software Foundation, Inc.
+   Copyright (C) 1989-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library and is also part of gnulib.
    Patches to this file should be submitted to both projects.
 
diff --git a/posix/bits/getopt_ext.h b/posix/bits/getopt_ext.h
index 5725062..d48069e 100644
--- a/posix/bits/getopt_ext.h
+++ b/posix/bits/getopt_ext.h
@@ -1,5 +1,5 @@
 /* Declarations for getopt (GNU extensions).
-   Copyright (C) 1989-2020 Free Software Foundation, Inc.
+   Copyright (C) 1989-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library and is also part of gnulib.
    Patches to this file should be submitted to both projects.
 
diff --git a/posix/bits/getopt_posix.h b/posix/bits/getopt_posix.h
index 8dda543..f49e1f3 100644
--- a/posix/bits/getopt_posix.h
+++ b/posix/bits/getopt_posix.h
@@ -1,5 +1,5 @@
 /* Declarations for getopt (POSIX compatibility shim).
-   Copyright (C) 1989-2020 Free Software Foundation, Inc.
+   Copyright (C) 1989-2021 Free Software Foundation, Inc.
    Unlike the bulk of the getopt implementation, this file is NOT part
    of gnulib.
 
diff --git a/posix/bits/posix1_lim.h b/posix/bits/posix1_lim.h
index f08ce04..c645847 100644
--- a/posix/bits/posix1_lim.h
+++ b/posix/bits/posix1_lim.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 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/posix/bits/posix2_lim.h b/posix/bits/posix2_lim.h
index 1a0ec13..7ac13cb 100644
--- a/posix/bits/posix2_lim.h
+++ b/posix/bits/posix2_lim.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1991-2021 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/posix/bits/types.h b/posix/bits/types.h
index a26cd38..2dc63de 100644
--- a/posix/bits/types.h
+++ b/posix/bits/types.h
@@ -1,5 +1,5 @@
 /* bits/types.h -- definitions of __*_t types underlying *_t types.
-   Copyright (C) 2002-2020 Free Software Foundation, Inc.
+   Copyright (C) 2002-2021 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/posix/bits/unistd.h b/posix/bits/unistd.h
index 6c5ed0c..f083138 100644
--- a/posix/bits/unistd.h
+++ b/posix/bits/unistd.h
@@ -1,5 +1,5 @@
 /* Checking macros for unistd functions.
-   Copyright (C) 2005-2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2021 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