[Toybox] [PATCH 2/2] xargs: add no-op -P.

[enh]

The Linux kernel has a hard-coded `-P 8`. As the simplest thing that
lets us successfully build a kernel, add a no-op -P.

Bug: http://b/140269206
---
 toys/posix/xargs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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