clearing env for make check

[Ulrich Drepper]

Roland McGrath <roland@frob.com> writes:

> Then, I'd change all the tests et al to pass --ignore-environment
> along with --library-path.
> 
> If this sounds good, then I can implement it.

Do we need another option?  Can't we simply test for the variables in
the toplevel Makefile and fail right away if any is defined?

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