remove duplicate includes

snprintf/vsnprintf return < 0 on error, rather than -1.

remove unused variable repllen.
i tried to see if it could be useful, but this function is kinda crazy.
from Julien Ramseier

rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable). these days, people use source. these id's do not provide
any benefit, and do hurt the small install media
(th

rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable). these days, people use source. these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

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lint makes it easy to find these really bad ones, like size_t n = snprintf

spacing

Check snprintf rval for -1

Sync with FreeBSD's xargs plus some fixes by me. This makes us
POSIX-compliant and adds some useful extensions. Most of the work
in FreeBSD was done by jmallett.