fix foreign test for i3nt #312

Job	Run time
ci (tpb, ubuntu-22.04, --pb --threads --enable-libffi, test-some-fast)	29m 6s
ci (a6osx, macos-12)	14m 41s
ci (ta6osx, macos-12)	18m 44s
ci (arm64osx, macos-14)	8m 46s
ci (tarm64osx, macos-14)	10m 31s
ci (i3le, ubuntu-22.04)	11m 30s
ci (ti3le, ubuntu-22.04)	14m 28s
ci (a6le, ubuntu-22.04)	9m 5s
ci (ta6le, ubuntu-22.04, CFLAGS+=-std=gnu89)	11m 54s
ci (ta6le, ubuntu-22.04, reboot, -m=ta6le --force, re.boot SCHEME="chezscheme", test-some-fast)	8m 21s
ci (i3nt, windows-2022, vs)	11m 55s
ci (ti3nt, windows-2022, vs)	14m 45s
ci (a6nt, windows-2022, vs)	11m 22s
ci (ta6nt, windows-2022, vs)	14m 43s
ci (ta6nt, windows-2022, gcc, CFLAGS+=-std=gnu89)	13m 32s
	3h 23m 23s

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