AS3 example .java SWIG generated files aren't cleaned up by ./gradlew clean

[dschmitt007]

Android build plugin: com.android.tools.build:gradle:3.0.0

The SWIG command in the CMakelist.txt drops files into:
app/src/main/java/com/sureshjoshi/core/

./gradlew clean
cleans app/src/main/java/com/sureshjoshi/core/SeePlusPlusJAVA_wrap.cxx

It misses the .java files generated by SWIG.