Merge jnigen #16

Job	Run time
build (ubuntu, stable, native_assets_builder, true)	3m 20s
build (ubuntu, stable, native_assets_cli, true)	1m 49s
build (ubuntu, stable, native_toolchain_c, true)	1m 54s
build (ubuntu, dev, native_assets_builder, true)	23s
build (ubuntu, dev, native_assets_cli, true)	24s
build (ubuntu, dev, native_toolchain_c, true)	18s
build (macos, stable, native_assets_builder, true)	8m 23s
build (macos, stable, native_assets_cli, true)	2m 42s
build (macos, stable, native_toolchain_c, true)	7m 16s
build (windows, stable, native_assets_builder, true)	4m 20s
build (windows, stable, native_assets_cli, true)	2m 45s
build (windows, stable, native_toolchain_c, true)	3m 41s
coverage-finished	6s
	37m 21s

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