Link tests after GCC_NO_EXECUTABLES

[Mark Mitchell]

Richard Sandiford wrote:

> Anyway, given that there have been objections to the patch generally,
> I realise that the pre-approval is void.

I think there's no controversy over the libstdc++ change, so let's put
that in.  If nothing else, it makes the libstdc++ configury more
self-consistent; if we decide to change the overall strategy, then we
can do that all at once.

Thanks,

-- 
Mark Mitchell
CodeSourcery
mark@codesourcery.com
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