Adding in vim patch for OSX 10.9 to allow building

Currently vim hasn't successfully built on Mavericks since a few weeks ago. This patch fixes that issue.

Described in more detail on [this vim-dev thread](https://docs.google.com/a/maluuba.com/spreadsheet/ccc?key=0AhaZqKZiqQDKdHVfRXUwZDJMRUd1TkxxME9pS1F1QWc#gid=3).

I've mirrored a copy on an S3 bucket because the version pasted on the thread has some sort of header that doesn't merge cleanly in Homebrew.

Tested and works on my local Mavericks.