XDK: Convert line endings from DOS to Unix.

This fixes the presubmit checks that were complaining about wrong line
endings (CRLF instead of just LF) in the xdk-* files, dating back from
when they were added to the tree.

`git blame' still works fine if passed the "-w" option (ignore
whitespace changes).
Merge pull request #67 from rakuco/fix-line-endings

XDK: Convert line endings from DOS to Unix.