miguely 289ccd7577 Add explicit exclusions to "**/build/**" in gradle files.
Since our source roots are the project's root directory, generated output falls inside it, unless properly excluded, all intermediate output such as R classes gets recompiled with each gradle pass.

This causes failures because of duplicate R classes.

PiperOrigin-RevId: 169588457
2017-09-21 16:13:59 -04:00
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