How to use external libraries.

## Problems summary
Can't use auto complete by external libraries.
I try this, but not auto and very slowly.

`setlocal path+=/Applications/Cocos/Cocos2d-x/cocos2d-x-3.6/cocos/`

``

looks like issue [#34](https://github.com/zchee/deoplete-clang/issues/34), but not fix think.
I want to use "cocos2d-x" library.

## Expected
Not use ``(want auto complete)
and more speedy.
This image is use `` result.

## Environment Information

- OS: OS X EI Capitan 10.11.6
- Neovim version: NVIM 0.1.6

## init.vim

```vim
setlocal path+=/Applications/Cocos/Cocos2d-x/cocos2d-x-3.6/cocos/
let g:deoplete#sources#clang#libclang_path = '/Library/Developer/CommandLineTools/usr/lib/libclang.dylib'
let g:deoplete#sources#clang#clang_header = '/Library/Developer/CommandLineTools/usr/lib/clang'
```

Start by comparing the init.vim configuration with issue #34 and then inspect the deoplete-clang source for handling the configured libclang and header paths. The issue is done when Cocos2d-x symbols are completed without and the result is acceptably responsive on the stated Neovim and macOS environment.

Written by the indexing model from the issue text.