make libstdc++ testsuite work better standalone

[Mark Mitchell]

Phil Edwards wrote:

> Seconded, mostly because I never saw any patch approval go by before it
> was committed. 

OK, clock running.

 > (But I might have missed it.)

Geoff has global write access.  (Which is not to say that people with 
global write access shouldn't ask for approval in some circumstances, 
but if he felt sufficient confident he didn't need to do so.)

-- 
Mark Mitchell
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