[Toybox] [PATCH] xargs: make --help match reality.

[enh]

Implement -p, -t, and -r.

Add some missing tests.

Move -L and -x back to TODO since they're not implemented and I haven't
yet even understood what they're supposed to do.
---
 tests/xargs.test   | 11 ++++++++++
 toys/posix/xargs.c | 50 ++++++++++++++++++++++++++++++----------------
 2 files changed, 44 insertions(+), 17 deletions(-)
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