Update to bootstrap tool flex/lex

[John Marino]

On 1/16/2013 20:12, John Marino wrote:
> I just updated a 17-year tool, flex, the master branch. It's a bootstrap
> tool. I think quickworld will still work, but I only tested the full
> buildworld. If you see any strange build errors involving lex, you
> probably want to do a full buildworld.

Unfortunately, it looks like there is a bootstrap problem upgrade to 
HEAD from prior to this commit:

http://gitweb.dragonflybsd.org/dragonfly.git/commit/4afad3d8f675d4c7d767e86520a3c2eda3d56658
m4: Sync with FreeBSD.
Tue, 15 Jan 2013 06:13:21 +0000 (22:13 -0800)

An upgrade may require first upgrading to this commit (or later up to 
but not including f506e60df4a2ee3cc470ddcbad8a149f756bec0f )

After that, it should be possible to build world to HEAD.
In the meantime I'll see if something can be done.

John