[RFC] vim-patch: Mark patches as NA.

* https://code.google.com/p/vim/source/detail?r=v7-4-558 deals with X11.
* https://code.google.com/p/vim/source/detail?r=v7-4-557 updates a function protype.
* https://code.google.com/p/vim/source/detail?r=v7-4-556 is about the Python interface (provider).
* https://code.google.com/p/vim/source/detail?r=v7-4-555 is about feature sets (tiny, small) in functional tests.