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

12 files changed, 12 insertions, 12 deletions

diff --git a/misc/sys/auxv.h b/misc/sys/auxv.h
index 1a563e1337..128cf39cda 100644
--- a/misc/sys/auxv.h
+++ b/misc/sys/auxv.h
@@ -1,5 +1,5 @@
 /* Access to the auxiliary vector.
-   Copyright (C) 2012-2020 Free Software Foundation, Inc.
+   Copyright (C) 2012-2021 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/misc/sys/cdefs.h b/misc/sys/cdefs.h
index 5fb6e309be..57ca262bdf 100644
--- a/misc/sys/cdefs.h
+++ b/misc/sys/cdefs.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
+/* Copyright (C) 1992-2021 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/misc/sys/dir.h b/misc/sys/dir.h
index fbaa2ca18e..d6a8c258f2 100644
--- a/misc/sys/dir.h
+++ b/misc/sys/dir.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/misc/sys/file.h b/misc/sys/file.h
index a1efc4c0af..23709437c9 100644
--- a/misc/sys/file.h
+++ b/misc/sys/file.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/misc/sys/ioctl.h b/misc/sys/ioctl.h
index 5a2363651d..ddd204d95f 100644
--- a/misc/sys/ioctl.h
+++ b/misc/sys/ioctl.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/misc/sys/mman.h b/misc/sys/mman.h
index 02abf589a0..37ac7b37fb 100644
--- a/misc/sys/mman.h
+++ b/misc/sys/mman.h
@@ -1,5 +1,5 @@
 /* Definitions for BSD-style memory management.
-   Copyright (C) 1994-2020 Free Software Foundation, Inc.
+   Copyright (C) 1994-2021 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/misc/sys/param.h b/misc/sys/param.h
index d7c319b157..72fd74d951 100644
--- a/misc/sys/param.h
+++ b/misc/sys/param.h
@@ -1,5 +1,5 @@
 /* Compatibility header for old-style Unix parameters and limits.
-   Copyright (C) 1995-2020 Free Software Foundation, Inc.
+   Copyright (C) 1995-2021 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/misc/sys/select.h b/misc/sys/select.h
index 29d011c2d5..188a7fe607 100644
--- a/misc/sys/select.h
+++ b/misc/sys/select.h
@@ -1,5 +1,5 @@
 /* `fd_set' type and related macros, and `select'/`pselect' declarations.
-   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/misc/sys/single_threaded.h b/misc/sys/single_threaded.h
index 648fc2e00a..8609c84f96 100644
--- a/misc/sys/single_threaded.h
+++ b/misc/sys/single_threaded.h
@@ -1,5 +1,5 @@
 /* Support for single-thread optimizations.
-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 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/misc/sys/sysmacros.h b/misc/sys/sysmacros.h
index ba4c7eddd2..e1b519cc72 100644
--- a/misc/sys/sysmacros.h
+++ b/misc/sys/sysmacros.h
@@ -1,5 +1,5 @@
 /* Definitions of macros to access `dev_t' values.
-   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/misc/sys/uio.h b/misc/sys/uio.h
index 26d87c9f34..474527d112 100644
--- a/misc/sys/uio.h
+++ b/misc/sys/uio.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/misc/sys/xattr.h b/misc/sys/xattr.h
index e3a43c1ea2..a87f676cca 100644
--- a/misc/sys/xattr.h
+++ b/misc/sys/xattr.h
@@ -1,4 +1,4 @@
-/* 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