devel/gradle: Update to 4.7.
- Gradle's incremental Java compiler can now run annotation processing
incrementally.
- Support for Gradle builds with JDK 10
- Gradle log output is now grouped by task for non-interactive
execution.
- Failed tests now run first. Together with the --fail-fast option it
provides the quickest possible feedback loop.
- Incubating new capability for Kotlin DSL users: precompiled script
plugins.
- Kotlin DSL v0.16 also includes Kotlin 1.2.31, a more consistent API,
better IDE support, and more.
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