RFC ftw() Test Patch

[Joel Sherrill]

Hi

With the recent newlib and tool updates, it should now be possible to merge
Eshan's ftw() test patches but this will result in the tests not building
with older tools which do not have ftw().

Does waf need to probe for ftw() presence on this test and only enable the
test when present? Or can this just be a breaking point? Is there a good
example of a.similar probe if this is desirable?

I'm wondering if we want to reintroduce this type of thing since it built
up clutter with the autotools build systems. during symmetric
multi-processing work we introduced a lot of these type of "temporary"
hacks.

Thanks

--joel
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