15471 replace csh based which(1) with implementation in C from BSD
Reviewed by: Andy Fiddaman <illumos@fiddaman.net>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Robert Mustacchi <rm+illumo

15471 replace csh based which(1) with implementation in C from BSD
Reviewed by: Andy Fiddaman <illumos@fiddaman.net>
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Robert Mustacchi <rm+illumos@fingolfin.org>
Reviewed by: Bill Sommerfeld <sommerfeld@alum.mit.edu>
Approved by: Dan McDonald <danmcd@mnx.io>

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