Chez Scheme: improve support for lists in cptypes (#858) #335

Job	Run time
ci (tpb, ubuntu-22.04, --pb --threads --enable-libffi, test-some-fast)	29m 51s
ci (a6osx, macos-12)	16m 2s
ci (ta6osx, macos-12)	22m 30s
ci (arm64osx, macos-14)	8m 39s
ci (tarm64osx, macos-14)	10m 49s
ci (i3le, ubuntu-22.04)	11m 26s
ci (ti3le, ubuntu-22.04)	14m 46s
ci (a6le, ubuntu-22.04)	8m 50s
ci (ta6le, ubuntu-22.04, CFLAGS+=-std=gnu89)	11m 59s
ci (ta6le, ubuntu-22.04, reboot, -m=ta6le --force, re.boot SCHEME="chezscheme", test-some-fast)	8m 19s
ci (i3nt, windows-2022, vs)	12m 1s
ci (ti3nt, windows-2022, vs)	14m 14s
ci (a6nt, windows-2022, vs)	11m 51s
ci (ta6nt, windows-2022, vs)	14m 50s
ci (ta6nt, windows-2022, gcc, CFLAGS+=-std=gnu89)	14m 20s
	3h 30m 27s

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