Error: The specified procedure could not be found. With sharp js.

## Issue or Feature

When using this with [sharp js](https://github.com/lovell/sharp) canvas fails to load.

`Error: The specified procedure could not be found. *\node_modules\canvas\build\Release\canvas.node`

## Steps to Reproduce
```js
// Both work fine
require('canvas');
require("sharp");

// Throws error
require("sharp");
require('canvas');
```

## Environment
* node-canvas (1.6.5)
* sharp (0.18.1)
* node 7.10.0 x64
* Windows 10