Fix missing ifplugin

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1449098 13f79535-47bb-0310-9956-ffa450edef68
Tweak lottery rules

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1449099 13f79535-47bb-0310-9956-ffa450edef68