[v3] Fix / clean-up config vs crosses (2/n)

[Paolo Carlini]

Paolo Carlini wrote:
> ... and, those C99 tests changed by Richard Sandiford (not Joseph 
> Myers, sorry) to use AC_TRY_COMPILE_OR_LINK are run *unconditionally*, 
> not only when native! Indeed, that seems the way to go. In case of 
> problems, we (the target maintainers, that is ;) can always add a yes 
> / no parameter and enable a configure time option...
This is the updated version of the patch, which I mean to apply, tested 
x86_64-linux.

Paolo.

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