Bug#1040237: RM: masqmail -- RoQA; dead upstream, RC-buggy

[Oswald Buddenhagen]

fwiw, because i failed to find a minimal replacement MTA that i actually 
liked, i just sort of revived masqmail:

https://github.com/ossilator/masqmail
i did some build system polishing; otherwise it's taken straight from 
meillo's repo, and i don't think i'll do much more with it.

i also updated the debian packaging a tiny bit (adjusted the patches):

https://github.com/ossilator/masqmail-debian