Add an additional flag that denotes whether the last-checked comment was spam.

This shouldn't have any effect on the functionality of Akismet in the real world, but it does allow us to do unit testing using the same comment content mutliple times without it confusing the plugin, since every comment will appear to be identical.


git-svn-id: https://plugins.svn.wordpress.org/akismet/trunk@890287 b8457f37-d9ea-0310-8a92-e5e31aec5664