#1 Spamc exit status

[Dan Margolis]

The current release uses the STDOUT output rather than
the exit status of spamc, meaning that anything with
ANY score > 0 is tagged as spam, even if it scores
below the spam threshold. This ugly patch fixes that,
at cost (due to my ignorance about IPC::Open2) of
temporarily not checking the open2 call for errors. You
might want to look into that.

[Dan Margolis]

patch