Bug#995188: jython: Move to antlr3

[Bastian Germann]

Source: jython
Version: 2.7.2+repack1-3
Severity: minor
Upstream has solved the ANTLR 3.5 incompaibilites in the currently packaged version, so the package 
can move to depend on antlr3 instead of antlr3.2 (which can be dropped after this is done).