deb: add missing LGPL-2.1 outline text

Just putting link of license is not recommended.

packages/debian/copyright

@@ -6,9 +6,39 @@ Source: http://packages.groonga.org/source/groonga/
 Files: *
 Copyright: Copyright 2009-2013 Brazil, Inc.
 License: LGPL-2.1
- See /usr/share/common-licenses/LGPL-2.1 for the full license text.
+ This package is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ .
+ This package 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
+ Lesser General Public License for more details.
+ .
+ You should have received a copy of the GNU Lesser General Public
+ License along with this package; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ .
+ On Debian systems, the complete text of the GNU Lesser General
+ Public License can be found in `/usr/share/common-licenses/LGPL-2.1'.
 
 Files: debian/*
 Copyright: Copyright 2011 Kouhei Sutou <kou@clear-code.com>
 License: LGPL-2.1
- See /usr/share/common-licenses/LGPL-2.1 for the full license text.
+ This package is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ .
+ This package 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
+ Lesser General Public License for more details.
+ .
+ You should have received a copy of the GNU Lesser General Public
+ License along with this package; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ .
+ On Debian systems, the complete text of the GNU Lesser General
+ Public License can be found in `/usr/share/common-licenses/LGPL-2.1'.