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

10 files changed, 10 insertions, 10 deletions

diff --git a/ctype/Makefile b/ctype/Makefile
index daaa908..e8b5684 100644
--- a/ctype/Makefile
+++ b/ctype/Makefile
@@ -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/ctype/ctype-c99.c b/ctype/ctype-c99.c
index 970d607..2f69ccc 100644
--- a/ctype/ctype-c99.c
+++ b/ctype/ctype-c99.c
@@ -1,5 +1,5 @@
 /* External function version of isblank.
-   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/ctype/ctype-c99_l.c b/ctype/ctype-c99_l.c
index 8352f36..b0e8cce 100644
--- a/ctype/ctype-c99_l.c
+++ b/ctype/ctype-c99_l.c
@@ -1,5 +1,5 @@
 /* External function version of isblank_l.
-   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/ctype/ctype-extn.c b/ctype/ctype-extn.c
index 76691ec..5d2a7e3 100644
--- a/ctype/ctype-extn.c
+++ b/ctype/ctype-extn.c
@@ -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/ctype/ctype-info.c b/ctype/ctype-info.c
index 15ee600..783cad1 100644
--- a/ctype/ctype-info.c
+++ b/ctype/ctype-info.c
@@ -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/ctype/ctype.c b/ctype/ctype.c
index e0f149f..8c89933 100644
--- a/ctype/ctype.c
+++ b/ctype/ctype.c
@@ -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/ctype/ctype.h b/ctype/ctype.h
index 351495a..86f2bcc 100644
--- a/ctype/ctype.h
+++ b/ctype/ctype.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/ctype/ctype_l.c b/ctype/ctype_l.c
index 79aaf8c..8c1830f 100644
--- a/ctype/ctype_l.c
+++ b/ctype/ctype_l.c
@@ -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/ctype/isctype.c b/ctype/isctype.c
index bc40b51..36b047b 100644
--- a/ctype/isctype.c
+++ b/ctype/isctype.c
@@ -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
diff --git a/ctype/test_ctype.c b/ctype/test_ctype.c
index 9b8227e..1cb65e5 100644
--- a/ctype/test_ctype.c
+++ b/ctype/test_ctype.c
@@ -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