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>

5 files changed, 2 insertions, 7 deletions

diff --git a/dlfcn/bug-dl-leaf-lib-cb.c b/dlfcn/bug-dl-leaf-lib-cb.c
index 2429b7e514..e75fa80a4e 100644
--- a/dlfcn/bug-dl-leaf-lib-cb.c
+++ b/dlfcn/bug-dl-leaf-lib-cb.c
@@ -3,7 +3,6 @@
 
    Copyright (C) 2013-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Mike Frysinger <vapier@gentoo.org>
 
    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/dlfcn/bug-dl-leaf-lib.c b/dlfcn/bug-dl-leaf-lib.c
index 6bb2e233cf..252189e35c 100644
--- a/dlfcn/bug-dl-leaf-lib.c
+++ b/dlfcn/bug-dl-leaf-lib.c
@@ -2,7 +2,6 @@
 
    Copyright (C) 2013-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Mike Frysinger <vapier@gentoo.org>
 
    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/dlfcn/bug-dl-leaf.c b/dlfcn/bug-dl-leaf.c
index 7a168940e4..78ef561424 100644
--- a/dlfcn/bug-dl-leaf.c
+++ b/dlfcn/bug-dl-leaf.c
@@ -3,7 +3,6 @@
 
    Copyright (C) 2013-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Mike Frysinger <vapier@gentoo.org>
 
    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/dlfcn/bug-dlopen1.c b/dlfcn/bug-dlopen1.c
index d91810a4f0..dcee832f4e 100644
--- a/dlfcn/bug-dlopen1.c
+++ b/dlfcn/bug-dlopen1.c
@@ -1,6 +1,5 @@
-/* Test case by Bruno Haible.  It test whether the dynamic string
-   token expansion can handle $ signs which do not start one of the
-   recognized keywords.  */
+/* Test whether the dynamic string token expansion can handle $ signs which do
+   not start one of the recognized keywords.  */
 
 #include <dlfcn.h>
 
diff --git a/dlfcn/tst-dladdr.c b/dlfcn/tst-dladdr.c
index 4657dc2b8a..bf988cc135 100644
--- a/dlfcn/tst-dladdr.c
+++ b/dlfcn/tst-dladdr.c
@@ -1,7 +1,6 @@
 /* Test for dladdr.
    Copyright (C) 2000-2021 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
-   Contributed by Volkmar Sieh <vs@caldera.de> and Andreas Jaeger <aj@suse.de>.
 
    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public