irrtoolset 5.0.0 release candidate

[Nick Hilliard]

I've just committed a couple of minor fixes to the irrtoolset sources to
fix several build problems, notably on ubuntu 9.10 and the recurring
problem with flex.  The package now compiles cleanly for me on os/x,
freebsd8, solaris 10, ubuntu 9.10 and debian lenny.

If anyone feels like testing this, please pull the latest trunk from svn.
I've updated the dev page on the wiki:

http://irrtoolset.isc.org/wiki/CruftCleanout

Hopefully we can get a release out the door shortly (I mean it this time).

Nick