You want to convert both the target file and the patch file to Unix line endings, as I said (you should be able to set this in TextWrangler; patch will try to convert the CRLF into LF, but it's best not to give it any grief). The notes mean that you already changed the file (three of the patches were still valid even after your edits, but two of the patches weren't able to recover at all, while 4 were). With a clean download of the mod, you should get no failures (assuming you update the paths and the line endings). If WeiDU wasn't built to run on Windows, CRLF wouldn't even really be supported at all (LF is preferred, always), so you can mostly totally ignore that (the game doesn't really like its TLK entries to be CRLF anyway, so I'm not sure how those description updates are turning out, but whatever).
I don't know about any of the other patches, and you're known for crazy big installs, so I'm not sure it even really matters; you'll have to ask the other people who try tons of mods at once. For the patches that succeed with no failures, it certainly shouldn't hurt, but if you don't experience any installation issues or know of any compatibility problems with the unpatched mods, it's at your discretion. Good luck!
Should I tell TextWrangler to use Unicode line breaks? When I save these documents, I change their setting from DOS to UNIX.
Thanks!
Eric