switch tounconditionnal boostrapping while to build the tree

[Robert Millan]

2012/5/27 Baptiste Daroussin <bapt at freebsd.org>:
> so if no one care I'll remove the condition to boostrap at least yacc(1) and
> lex(1) on current, 9, 8 and 7.

While we are at it, would you mind if ${YACC} was set to "byacc" on current?

This would make sys.mk re-usable on systems where "yacc" is a symlink
to bison (e.g. Debian).

-- 
Robert Millan
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