clearing env for make check

[Ulrich Drepper]

Roland McGrath <roland@frob.com> writes:

> Well, maybe you want it for running your compilers or whatnot.  It's only
> when running our own programs via ld.so that we have any business telling
> somebody what preloads they might want in their life.  But I wouldn't
> object to what you suggest.

Well, I could imagine a use of the variables when building glibc.  So
a new option would help.  But make sure that the tests which do need
LD_ variables have no problems.

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