[exim] 4.80 on OpenBSD

Folks,

With setting just the exim user and group, in src/EDITME and moving into
Local/Makefile, Exim 4.80 built from source in a little under 38
wall-clock seconds.

Thinkpad T60p, OpenBSD 5.1 GENERIC.MP#255 i386

I am retiring, will not be updating, so have neither installed nor
tested the binary just built on a production server myself.

I have, however, dropped a note to the OpenBSD maintainer for the Exim
package.

Bill Hacker
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