Bug#875336: FTBFS with Java 9: _ as identifier

[殷啟聰 | Kai-Chung Yan]

I recently updated the package to 3.5.0 just to find out the current Groovy (2.4.8) does not support Java 9 [1]. Groovy was used by the bootstrapping script. Setting source & target to Java 8 doesn't solve the problem either.

[1]: https://github.com/gradle/gradle/issues/2995

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