Copyright for libtool source package in Mantic

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Upstream-Name: GNU Libtool
Upstream-Contact: https://www.gnu.org/software/libtool
Source: https://ftp.gnu.org/pub/gnu/libtool

Files: *
Copyright:1996-2015 Free Software Foundation, Inc.
License: GPL-2+

Files: doc/*
Copyright: 1996-2015 Free Software Foundation, Inc.
License: GFDL-NIV-1.3+

Files: debian/*
Copyright: 2018-     Alastair McKinstry 
           2007      Piotr Roszatycki 
           2005-2016 Kurt Roeckx 
           2003-2005 Scott James Remnant 
License: GPL-2+

License: GPL-2+
 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
 the Free Software Foundation; either version 2 of the License, or (at
 your option) any later version.
 .
 This program is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 General Public License for more details.
 .
 As a special exception to the GNU General Public License, if you
 distribute this file as part of a program that contains a
 configuration script generated by Autoconf, you may include it under
 the same distribution terms that you use for the rest of that
 program.
 .
 On Debian GNU/Linux systems, the complete text of the GNU General
 Public License can be found in `/usr/share/common-licenses/GPL-2'.

License: GFDL-NIV-1.3+
 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
 any later version published by the Free Software Foundation; with no
 Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
 Texts.  A copy of the license is included in the section entitled
 "GNU Free Documentation License".
 .
 On Debian GNU/Linux systems, the complete text of the GNU Free
 Documentation License can be found in
 `/usr/share/common-licenses/GFDL-1.3'.