Merge jnigen #4

Job	Run time
analyze_jnigen (stable)	50s
analyze_jni	1m 2s
build_jni_example_linux	1m 51s
build_jni_example_windows	3m 14s
run_pdfbox_example_linux	2m 58s
build_jni_example_android	4m 5s
test_jnigen_macos_minimal	5m 20s
test_jnigen_windows_minimal	7m 7s
test_jnigen (ubuntu-latest, stable)	10m 10s
test_jnigen (ubuntu-latest, beta)	7m 44s
test_jni	1m 40s
test_jni_windows_minimal	5m 42s
test_jni_macos_minimal	3m 33s
coveralls_finish	0s
	55m 16s

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