[Toybox] [PATCH] cpio: add -d

[Isaac Dunham]

Support cpio -d.
cpio -d is similar in logic to mkdir -p, so split out the relevant code.

--
r_mkdir should probably go in one or another of the headers, and
r_mkdir.c should go in pending.c or lib.c; but I wasn't sure how to
proceed on that front.

Thanks,
Isaac Dunham
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