Android controller Gradle project build warning

[externl]

The Android controller Gradle build emits this warning. We should fix it!

❯ ./gradlew  build

> Configure project :
WARNING: Using flatDir should be avoided because it doesn't support any meta-data formats.

> Task :compileDebugJavaWithJavac
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

> Task :compileReleaseJavaWithJavac
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

> Task :lintReportDebug
Wrote HTML report to file:///Users/joe/Developer/zeroc-ice/ice/java/test/android/controller/build/reports/lint-results-debug.html