Bug#915509: scala ftbfs: The repository system could not be initialized

[Emmanuel Bourg]

Control: reassign -1 libaether-ant-tasks-java
Control: affects -1 src:scala
Control: severity -1 important

This is actually an issue with libaether-ant-tasks-java, the classpath
of aether-ant-tasks.jar is missing slf4j-api.jar. This issue was
probably triggered by the update of Maven to the version 3.6.

Emmanuel Bourg