Adding in vim patch for OSX 10.9 to allow building

Described in more detail on vim-dev at:
https://docs.google.com/a/maluuba.com/spreadsheet/ccc\?key\=0AhaZqKZiqQDKdHVfRXUwZDJMRUd1TkxxME9pS1F1QWc\#gid\=3