Log Spam = yes is too verbose

[Tom G. Christensen]

Hello,

I recently upgraded from 4.62.9 to 4.74.16 and was sad to see that "Log 
Spam = yes" now logs the subject of the mails in the maillog.

I depend on the output from "Log Spam = yes" to do my stats but I would 
very much prefer not to have all the garbage from the subjects of spam 
mails in my maillog.

Could we please have a way to turn of just this logging of the subject 
line? (ie. "Log Spam Subject = no" or something).

-tgc