Patch for musl support

[barak.pearlmutter at gmail.com]

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Good point. Why is it being used anyway? The "right" thing to do is

#ifdef HAVE_FTW_ACTIONRETVAL

with a configuration-time (cmake) check, if it's actually of use.
Although as you point out, it seems a little silly here.

In fact, I'd suggest system("rm -r ...") would make more sense than
this code, and almost certainly be faster for large trees.
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