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/unix/sysv/linux/csky/abiv2/____longjmp_chk.S b/sysdeps/unix/sysv/linux/csky/abiv2/____longjmp_chk.S
index 4e6a6e984b..3c328d1275 100644
--- a/sysdeps/unix/sysv/linux/csky/abiv2/____longjmp_chk.S
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/____longjmp_chk.S
@@ -1,5 +1,5 @@
 /* longjmp with sp check for C-SKY ABIV2.
-   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/sysdeps/unix/sysv/linux/csky/abiv2/clone.S b/sysdeps/unix/sysv/linux/csky/abiv2/clone.S
index b84921d69e..8972f87434 100644
--- a/sysdeps/unix/sysv/linux/csky/abiv2/clone.S
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/clone.S
@@ -1,5 +1,5 @@
 /* Wrapper around clone system call.  C-SKY ABIV2 version.
-   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/sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S b/sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S
index 4e6f30c9a9..bed2ba1247 100644
--- a/sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/getcontext.S
@@ -1,5 +1,5 @@
 /* Save current context.  C-SKY ABIV2 version.
-   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/sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S b/sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S
index 5d678fa06b..cd68e061d7 100644
--- a/sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/setcontext.S
@@ -1,5 +1,5 @@
 /* Set saved user context to current context.  C-SKY ABIV2 version.
-   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/sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S b/sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S
index 48d37dc7b5..b559a11678 100644
--- a/sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/swapcontext.S
@@ -1,5 +1,5 @@
 /* Save and set current context.  C-SKY ABIV2 version.
-   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/sysdeps/unix/sysv/linux/csky/abiv2/syscall.S b/sysdeps/unix/sysv/linux/csky/abiv2/syscall.S
index 7d5433c628..81283d4340 100644
--- a/sysdeps/unix/sysv/linux/csky/abiv2/syscall.S
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/syscall.S
@@ -1,5 +1,5 @@
 /* System call interface.  C-SKY ABIV2 version.
-   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/sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S b/sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S
index fe6b600bdc..2841ec5871 100644
--- a/sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S
+++ b/sysdeps/unix/sysv/linux/csky/abiv2/sysdep.S
@@ -1,5 +1,5 @@
 /* syscall error handlers.  C-SKY ABIV2 version.
-   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