LCL: change the license header in Arrow source. Refer to COPYING.modifiedLGPL.txt.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41386 4005530d-fff6-0310-9dd1-cebe43e6787f
Improve license headers in sources, part 1. Refer to details about license, not copyright. Remove jargon about lack of warranty, it is covered in license already.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41387 4005530d-fff6-0310-9dd1-cebe43e6787f