[Toybox] [PATCH] Fix xargs -0 with -n.

[enh]

Also make -0 and -E mutually exclusive (rather than just ignore -E
with -0).

Bug: https://github.com/landley/toybox/issues/78
---
 tests/xargs.test   | 3 +++
 toys/posix/xargs.c | 5 ++---
 2 files changed, 5 insertions(+), 3 deletions(-)
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