Update nvi to 2.2.0
Main changes:
- Vim-style expandtab option
- Provides Turkish translation
- Backspace now deletes \ rather than being escaped
- T during motion commands is now VI-compatible
- Encoding related fixes, such as UTF-8 detection
- Fixed a number of memory management issues
(cherry picked from commit 110d525ec6188f3c9dc4f54c4bc1cced2f7184cd)