16873 tools: add lex to build tools
Reviewed by: Bill Sommerfeld <sommerfeld@hamachi.org>
Approved by: Dan McDonald <danmcd@mnx.io>

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>