Remove "Contributed by" lines

We stopped adding "Contributed by" or similar lines in sources in 2012
in favour of git logs and keeping the Contributors section of the
glibc manual up to date.  Removing these lines makes the license
header a bit more consistent across files and also removes the
possibility of error in attribution when license blocks or files are
copied across since the contributed-by lines don't actually reflect
reality in those cases.

Move all "Contributed by" and similar lines (Written by, Test by,
etc.) into a new file CONTRIBUTED-BY to retain record of these
contributions.  These contributors are also mentioned in
manual/contrib.texi, so we just maintain this additional record as a
courtesy to the earlier developers.

The following scripts were used to filter a list of files to edit in
place and to clean up the CONTRIBUTED-BY file respectively.  These
were not added to the glibc sources because they're not expected to be
of any use in future given that this is a one time task:

https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc
https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

6 files changed, 0 insertions, 6 deletions

diff --git a/time/ctime_r.c b/time/ctime_r.c
index a69c3d61d8..b02f246e27 100644
--- a/time/ctime_r.c
+++ b/time/ctime_r.c
@@ -1,7 +1,6 @@
 /* Return in BUF representation of time T in form of asctime
    Copyright (C) 1996-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
 
    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/time/difftime.c b/time/difftime.c
index c7c2b691fe..77fadb7c74 100644
--- a/time/difftime.c
+++ b/time/difftime.c
@@ -15,7 +15,6 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-/* Written by Paul Eggert <eggert@cs.ucla.edu>.  */
 
 #include <time.h>
 
diff --git a/time/getdate.c b/time/getdate.c
index cdcc898517..4cd43cc58a 100644
--- a/time/getdate.c
+++ b/time/getdate.c
@@ -1,7 +1,6 @@
 /* Convert a string representation of time to a time value.
    Copyright (C) 1997-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Mark Kettenis <kettenis@phys.uva.nl>, 1997.
 
    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/time/tst-clock.c b/time/tst-clock.c
index 64ec883b71..2c807dbe5b 100644
--- a/time/tst-clock.c
+++ b/time/tst-clock.c
@@ -1,7 +1,6 @@
 /* Test program for POSIX clock_* functions.
    Copyright (C) 2000-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
 
    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/time/tst-getdate.c b/time/tst-getdate.c
index 3bb0e96707..b5876633e1 100644
--- a/time/tst-getdate.c
+++ b/time/tst-getdate.c
@@ -1,7 +1,6 @@
 /* Test for getdate.
    Copyright (C) 2000-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Andreas Jaeger <aj@suse.de>, 2000.
 
    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/time/tst-strptime.c b/time/tst-strptime.c
index f2af7d4ad5..2bf2b9fac9 100644
--- a/time/tst-strptime.c
+++ b/time/tst-strptime.c
@@ -1,7 +1,6 @@
 /* Test for strptime.
    Copyright (C) 1998-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public