[tuples] Fix all check-target-libstdc++-v3 ICEs

[Paolo Carlini]

Jakub Jelinek wrote:
> I'm very sorry, after checking the facts it is me who is backing the
> fr_FR changes out temporarily, because it came too late in the 2.8
> cycle and could break a lot of stuff.
>
> Instead of conditionalizing the testcases on glibc version, couldn't
> you better just pick up some locale that hasn't changed time LC_TIME
> over the time?  Say nl_NL, es_ES, etc.?
>   
Thanks for the clarification, Jakub.

I agree, changing locale makes sense, I don't think there is anything in 
those tests depending critically on the exact locale. I'll see what I 
can do...

Paolo.