Log Message:
Update devel/gradle to 4.2.

Significant changes:

- Parallel native compilation and linking tasks
- Faster zipTree and tarTree
- Better support for script plugins from HTTP/HTTPS URLs
- Support for Google Cloud Storage backed repositories
- Better Play support
- Features for easier plugin authoring
- UX improvements
- Safer handling of stale output files
- Connect to untrusted HTTPS build cache

See full release notes:

  https://docs.gradle.org/4.2/release-notes.html