C++ PATCH for c++/48322 (broken handling of variadic parms on multiple levels)

[Jason Merrill]

On 11/20/2011 07:22 PM, Jason Merrill wrote:
> Hmm, actually, that still shouldn't have produced an error, it should
> just SFINAE. Another bug to fix...

Thus.

Tested x86_64-pc-linux-gnu, applying to trunk.

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