Add JavaC flags and bootclasspath to JavaDetails.
Add JavaC flags and bootclasspath to JavaDetails.

Summary:
Allow the extractor record boot classpath information, as well as any
additional JavaC options required for analysis that are not part of the
build config.

Reviewers: salguarnieri, #core_team

Reviewed By: salguarnieri, #core_team

Differential Revision: https://phabricator-dot-kythe-repo.appspot.com/D1088

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