[Toybox] [PATCH] xargs: "proper" fix for E2BIG.

[enh]

This change switches xargs over to correct accounting of space, and
differentiating between the -s limit (which doesn't include the (char *)
overhead) and the kernel limit (which does).

I've added the two easy repro cases (at least for my desktop and
laptop), but left them commented out since they're a bit questionable as
tests.
---
 tests/xargs.test   |  6 ++++++
 toys/posix/xargs.c | 38 ++++++++++++++++++++++++--------------
 2 files changed, 30 insertions(+), 14 deletions(-)
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