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/sysdeps/unix/sysv/linux/riscv/bits/environments.h b/sysdeps/unix/sysv/linux/riscv/bits/environments.h
index 9ee21a217d..a10e407230 100644
--- a/sysdeps/unix/sysv/linux/riscv/bits/environments.h
+++ b/sysdeps/unix/sysv/linux/riscv/bits/environments.h
@@ -1,4 +1,4 @@
-/* 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/sysdeps/unix/sysv/linux/riscv/bits/fcntl.h b/sysdeps/unix/sysv/linux/riscv/bits/fcntl.h
index 4056de5f70..51c6dfbcad 100644
--- a/sysdeps/unix/sysv/linux/riscv/bits/fcntl.h
+++ b/sysdeps/unix/sysv/linux/riscv/bits/fcntl.h
@@ -1,5 +1,5 @@
 /* O_*, F_*, FD_* bit values for Linux / RISC-V.
-   Copyright (C) 2011-2020 Free Software Foundation, Inc.
+   Copyright (C) 2011-2021 Free Software Foundation, Inc.
 
    This file is part of the GNU C Library.
 
diff --git a/sysdeps/unix/sysv/linux/riscv/bits/procfs.h b/sysdeps/unix/sysv/linux/riscv/bits/procfs.h
index 7e5b115093..487d0f08a6 100644
--- a/sysdeps/unix/sysv/linux/riscv/bits/procfs.h
+++ b/sysdeps/unix/sysv/linux/riscv/bits/procfs.h
@@ -1,5 +1,5 @@
 /* Types for registers for sys/procfs.h.  RISC-V version.
-   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/sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h b/sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h
index 4b7c09e6a3..14e4e06fac 100644
--- a/sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h
+++ b/sysdeps/unix/sysv/linux/riscv/bits/sigcontext.h
@@ -1,5 +1,5 @@
 /* Machine-dependent signal context structure for Linux.  RISC-V version.
-   Copyright (C) 1996-2020 Free Software Foundation, Inc.  This file is part of the GNU C Library.
+   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
    modify it under the terms of the GNU Lesser General Public
diff --git a/sysdeps/unix/sysv/linux/riscv/bits/time64.h b/sysdeps/unix/sysv/linux/riscv/bits/time64.h
index 139a7c7335..e2336a9543 100644
--- a/sysdeps/unix/sysv/linux/riscv/bits/time64.h
+++ b/sysdeps/unix/sysv/linux/riscv/bits/time64.h
@@ -1,5 +1,5 @@
 /* bits/time64.h -- underlying types for __time64_t.  RISC-V version.
-   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/sysdeps/unix/sysv/linux/riscv/bits/timesize.h b/sysdeps/unix/sysv/linux/riscv/bits/timesize.h
index 728d6c5053..1843ad57d8 100644
--- a/sysdeps/unix/sysv/linux/riscv/bits/timesize.h
+++ b/sysdeps/unix/sysv/linux/riscv/bits/timesize.h
@@ -1,5 +1,5 @@
 /* Bit size of the time_t type at glibc build time, RISC-V case.
-   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