[Toybox] [PATCH] xargs: distinguish the two "argument too long" error cases.

[enh]

One is really "the command is too long for me to ever call it given
other constraints", so leave "argument too long" for the case where it's
actually an argument causing the issue.
---
 toys/posix/xargs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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