Milter-greylist

The idea is that if configure tries to ruin your day, you can just tweak
the Makefile.

Sure, but it also means that 'cvs diff' is noisy because checked-in
files get changed as part of a normal build. I view making autoconf
work on a project that uses it as non-optional, but the checked-in
generated files are not actually causing me significant grief.

I checked in your change.

Thanks.