vim-patch:7.4.374

Problem:    Character after "fb" command not mapped if it might be a composing
            character.
Solution:   Don't disable mapping when looking for a composing character.
            (Jacob Niehus)

https://code.google.com/p/vim/source/detail?r=v7-4-374
Merge pull request #1189 from Shougo/vim-patch-7.4.374

vim-patch:7.4.374