Add Official Nintendo Gamecube adapter support

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What steps will reproduce the problem?
1.No problem, enhancement request

Maybe it's a little early, but once it's out, wouldn't it be fantastic if 
Ninitendon't would support the Nintendo USB adapter for up to four Gamecube 
controllers?

http://store.nintendo.co.uk/wii-u-accessories/gamecube-controller-adapter-for-wi
i-u/11028551.html

We would be able to use the Gamecube controller, the controller GC games are 
meant to be played. Even if we still don't know how it works, analogue shoulder 
buttons could probably be realised.
And many people still have lots of this great controllers at home, would be 
nice to be able to use them!

Original issue reported on code.google.com by wolfgang...@gmail.com on 10 Oct 2014 at 10:41

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And these controllers are getting re-released for use with Smash Bros. ;)

Original comment by tarki...@gmail.com on 11 Oct 2014 at 5:43

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Also, in Japan they kept producing them (maybe they still are producing them) 
in a white edition with an extra long cord for the old Wii.

https://en.wikipedia.org/wiki/Nintendo_GameCube_controller#White_controller

It would only be logical to make usage of this!

Original comment by wolfgang...@gmail.com on 11 Oct 2014 at 3:40

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Addded in r225

Original comment by Howard_M...@yahoo.com on 3 Dec 2014 at 5:02

• Changed title: Add Official Nintendo Gamecube adapter support
• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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Original comment by Howard_M...@yahoo.com on 3 Dec 2014 at 5:05

• Changed state: Verified