[patch] Simplify std::tuple helpers and fix C++14 bug.

[Jonathan Wakely]

On 15/05/14 07:36 +0200, Daniel Krügler wrote:
>Looking at the definition of the new alias
>
>__cv_tuple_size
>
>you might want to apply LWG 2313
>
>http://cplusplus.github.io/LWG/lwg-defects.html#2313
>
>and simplify its definition even further.

I forgot about that. With that resolution the __cv_tuple_size alias
doesn't seem worth using, it's simple enough anyway. Thanks!

Tested x86_64-linux, committed to trunk.
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