16319 tools: add yacc to build tools
Reviewed by: Andy Fiddaman <illumos@fiddaman.net>
Reviewed by: Gordon Ross <Gordon.W.Ross@gmail.com>
Approved by: Dan McDonald <danmcd@mnx.io>

14311 yacc: clang build cleanup
Reviewed by: Rich Lowe <richlowe@richlowe.net>
Approved by: Dan McDonald <danmcd@joyent.com>

OpenSolaris Launch