Adds netifaces recipe, closes #239
Adds netifaces recipe, closes #239

Note this is an early version working on the `x86_64` simulator.
It wasn't tested on an arm device.
Requires setuptools to be installed:
```sh
python toolchain.py pip install setuptools
```
Tested with main.py:
```python
import netifaces
print("interfaces:", netifaces.interfaces())
```
And produced the following output in the `x86_64` simulator:
```
Available orientation: KIVY_ORIENTATION=LandscapeLeft LandscapeRight Portrait PortraitUpsideDown
Initializing python
Running main.py: /Users/vagrant/Library/Developer/CoreSimulator/Devices/.../Application/.../testnetifaces.app/YourApp/main.pyc
interfaces: ['lo0', 'gif0', 'stf0', 'en0', 'utun0', 'utun1']
Leaving
```

kivy/kivy-ios,kivy/kivy-ios,kivy/kivy-ios