[jnigen] Include superinterface methods #637

Job	Run time
analyze_jni	1m 1s
analyze_jnigen (stable)	42s
build_jni_example_android	4m 18s
build_jni_example_linux	1m 36s
build_jni_example_windows	4m 44s
run_pdfbox_example_linux	1m 53s
test_jnigen (ubuntu-latest, stable)	7m 0s
test_jnigen_windows_minimal	9m 51s
test_jnigen (ubuntu-latest, beta)	6m 48s
test_jnigen_macos_minimal	5m 8s
test_jni_macos_minimal	1m 54s
test_jni_windows_minimal	4m 9s
test_jni	2m 9s
coveralls_finish	0s
	51m 13s

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