add ffi tests & fix ffi #1328

Job	Run time
report	1m 36s
build-test (windows-latest, stable, x86_64-pc-windows-msvc, true)	4m 9s
style	35s
build-test (macos-latest, stable, x86_64-apple-darwin, true)	1m 24s
build-test (ubuntu-20.04, stable, x86_64-unknown-linux-gnu, true)	1m 29s
build-test (ubuntu-22.04, stable, x86_64-unknown-linux-gnu, true)	1m 25s
build-test (ubuntu-22.04, stable, i686-unknown-linux-gnu, true)	1m 59s
build-test (ubuntu-22.04, nightly, wasm32-unknown-unknown, true, --no-default-features, --no-run ...	1m 8s
build-test (ubuntu-22.04, 1.77, x86_64-unknown-linux-gnu)	1m 25s
build-test (ubuntu-22.04, beta, x86_64-unknown-linux-gnu)	1m 18s
build-test (ubuntu-22.04, nightly, x86_64-unknown-linux-gnu, true, miri)	1m 36s
logtalk-test	0s
release	0s
	18m 4s

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