Make "find -execdir toys echo {} +" batch correctly and show topdir results.

I dunno if find -execdir should show depth-first like it's doing, bit given
that ubuntu's treating "+" and ";" the same for execdir... eh?

Also, testing "find toys tests -mindepth 2 -execdir echo {} +" against
the toybox source is easy (and why if (revert) fchdir() is needed), but
adding that to the test suite means making a nontrivial hierarchy of files
to test against (don't wanna use the project source because it's expected
to change in ways that would break the tests)... The old "real world data
vs test data" problem.
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