vim: add option to disable NLS support

- Some distributions with UTF-8 locale have problem when National Language
Support is enabled. Add there an option to disable it.

Signed-off-by: Andrej Valek <andrej.valek@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit da630d6d)
Signed-off-by: Steve Sakoman <steve@sakoman.com>