Bug#906398: projectreactor: FTBFS in buster/sid

[Emmanuel Bourg]

Control: reassign -1 libjarjar-java
Control: affects -1 src:projectreactor

This is an issue with the jarjar Ant task that no longer works but I
fail to understand exactly why. The classes in the disruptor jar should
be relocated to reactor.jarjar.com.lmax.disruptor but it doesn't happen
and this leads to compilation errors.

It looks like the error was triggered by the upload of
disruptor/3.4.2-1, projectreactor builds fine with the version 3.3.11-1.

Rebuilding jarjar with ASM 7 instead of 5 fixes the issue. I guess
something specific to Java 9+ was introduced when building disruptor
3.4.2-1 and it derailed the jarjar processing.

Emmanuel Bourg