add ffi tests & fix ffi #1332

Job	Run time
report	16m 19s
style	34s
build-test (windows-latest, stable, x86_64-pc-windows-msvc, true)	15m 47s
build-test (macos-latest, stable, x86_64-apple-darwin, true)	7m 58s
build-test (ubuntu-20.04, stable, x86_64-unknown-linux-gnu, true)	8m 8s
build-test (ubuntu-22.04, stable, x86_64-unknown-linux-gnu, true)	8m 4s
build-test (ubuntu-22.04, stable, i686-unknown-linux-gnu, true)	9m 50s
build-test (ubuntu-22.04, nightly, wasm32-unknown-unknown, true, --no-default-features, --no-run ...	6m 20s
build-test (ubuntu-22.04, 1.77, x86_64-unknown-linux-gnu)	4m 33s
build-test (ubuntu-22.04, beta, x86_64-unknown-linux-gnu)	4m 6s
build-test (ubuntu-22.04, nightly, x86_64-unknown-linux-gnu, true, miri)	6m 10s
logtalk-test	8m 0s
release	0s
	1h 35m 49s

Provide feedback