[RDY] vim-patch:7.4.457

```
Problem:  Using getchar() in an expression mapping may result in
          K_CURSORHOLD, which can't be recognized.
Solution: Add the <CursorHold> key.  (Hirohito Higashi)

https://code.google.com/p/vim/source/detail?r=v7-4-457
```

Succeeds #1226.