fix issue with symlink attributes

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10013 a83610d8-ad2a-0410-a6ab-fc0612d85776
remove restrictions on pad_file_limit and alignment when creating torrents. This makes the torrent creator more flexible to create all-padded files for instance

git-svn-id: https://svn.code.sf.net/p/libtorrent/code/trunk@10015 a83610d8-ad2a-0410-a6ab-fc0612d85776