Fixed little bug causing the AntMessageLogger never being unregistered as an Ant BuildListener.
Fixed little bug causing the AntMessageLogger never being unregistered as an Ant BuildListener.

git-svn-id: bddd0b838a5b7898c5897d85c562f956f46262e5@643637 13f79535-47bb-0310-9956-ffa450edef68

pantsbuild/ivy,pantsbuild/ivy