Milter-greylist

I finally got the cvs version to compile (now I remember why I gave up  
awhile ago doing this)

the configure script tests for libmilter, but pthread isn't added, and  
is needed atleast on my freebsd, 6.2

I had to upgrade libdkim to get the configure script not to throw a  
fit about it (kept complaining of missing pthread till I upgraded  
dkim). Have version 2.6.0 now, and it needs libar