Log Message:
Import nbitools-6.3

The itools-R6.3 distribution contains imake, X11 configuration files,
makedepend, xmkmf, mkdirhier, imboot, msub, and imdent.
http://www.kitebird.com/imake-book/
nbitools-R6.3 is rearchived with NetBSD-current/xsrc.

Approved by agc, for inputmethod/{canna-*,sj3-*}