Log Message:
devel/apache-ivy: Update to 2.4.0.

2.4.0
- some new Ant tasks
- improved OSGI support
- a Bintray resolver
- numerous bug fixes as documented in Jira and in the release notes

2.3.0
- improved Ant support with some new Ant tasks and enhancements to
  existing tasks
- improved Maven2 compatibility
- some new resolvers
- numerous bug fixes as documented in Jira and in the release notes