Backwards logic in newer check.

Regen .ant_targets only if it's newer than build.xml? Yeah, that seems wrong.

plugins/ant/ant.plugin.zsh

 _ant_does_target_list_need_generating () {
   [ ! -f .ant_targets ] && return 0;
-  [ .ant_targets -nt build.xml ] && return 0;
+  [ build.xml -nt .ant_targets ] && return 0;
   return 1;
 }