Bug#892760: antlr3: FTBFS with Java 9

[Tiago Daitx]

I am attaching a simple fix to get rid of the FTBFS when building with
openjdk-9.

BTW, I didn't mention this before, but the reason that javadoc goals
worked with openjdk-8 is because openjdk-8's javadoc binary ignored
the missing packages/files instead of failing to run - the
documentation for the generated sources was never included.

thanks

-- 
Tiago Stürmer Daitx
Software Engineer
tiago.daitx at canonical.com

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