Make a written offer pointing to a central WordPress.org URL for obtaining the...

Make a written offer pointing to a central WordPress.org URL for obtaining the source to any binary programs included in WordPress, instead of relying on third party sites. Include the MIT license file that the swfupload project omitted from their codebase. fixes #16517 for trunk

git-svn-id: https://core.svn.wordpress.org/trunk@17472 1a063a9b-81f0-0310-95a4-ce76da25c4cd