Bug#283667: ant: Move from contrib to main

[Kalle Kivimaa]

Piotr Roszatycki <dexter@debian.org> writes:
> Please move the package from contrib to the main archive.
>
> The ant works with free Java, i.e. sablevm.

Ant works with free Java but does not build without libraries in
contrib. As such it cannot go into main until at least libbcel-java,
libbsf-java and libjdepend-java have been moved to main.

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