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>

scripts/gen-sorted.awk

@@ -2,7 +2,6 @@
 # Generate sorted list of directories.  The sorting is stable but with
 # dependencies between directories resolved by moving dependees in front.
 # Copyright (C) 1998-2021 Free Software Foundation, Inc.
-# Written by Ulrich Drepper <drepper@cygnus.com>, 1998.
 
 BEGIN {
   cnt = split(subdirs, all) + 1

scripts/rellns-sh

@@ -1,7 +1,6 @@
 #!/bin/sh
 # rellns-sh - Simplified ln program to generate relative symbolic link.
 # Copyright (C) 1996-2021 Free Software Foundation, Inc.
-# Written by Ulrich Drepper <drepper@cygnus.com>, October 1996
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by

scripts/test-installation.pl

@@ -1,7 +1,6 @@
 #!/usr/bin/perl -w
 # Copyright (C) 1997-2021 Free Software Foundation, Inc.
 # This file is part of the GNU C Library.
-# Contributed by Andreas Jaeger <aj@arthur.rhein-neckar.de>, 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

scripts/versions.awk

@@ -1,6 +1,5 @@
 # Combine version map fragments into version scripts for our shared objects.
 # Copyright (C) 1998-2021 Free Software Foundation, Inc.
-# Written by Ulrich Drepper <drepper@cygnus.com>, 1998.
 
 # This script expects the following variables to be defined:
 # defsfile		name of Versions.def file