[patch] Preprocessorised tr1::tuple

[Paolo Carlini]

Jonathan Wakely wrote:

>Seriously, I haven't used PCH for anything but trivial tests, because
>they're broken on FreeBSD (and the impression I get is they're broken
>nearly everywhere except Linux, though I think that's unfair and I've
>had a bad impression of them.)
>
About this: probably, the current situation it's a little better than 
you depicts
it: both more platforms supported and in a safer way. And, well, I would be
very surprised if they are broken on Darwin (given the author of the code ;)

Paolo.