improve makefile cooperation with zuofiles #12

Job	Run time
ci (tpb, ubuntu-22.04, --pb --threads --enable-libffi, test-some-fast)	37m 50s
ci (a6osx, macos-12)	18m 18s
ci (ta6osx, macos-12)	22m 46s
ci (i3le, ubuntu-22.04)	18m 15s
ci (ti3le, ubuntu-22.04)	20m 19s
ci (a6le, ubuntu-22.04)	15m 19s
ci (ta6le, ubuntu-22.04)	22m 5s
ci (ta6le, ubuntu-22.04, reboot, -m=ta6le --force, re.boot SCHEME="chezscheme", test-some-fast)	15m 6s
ci (i3nt, windows-2022, vs)	35m 36s
ci (ti3nt, windows-2022, vs)	42m 24s
ci (a6nt, windows-2022, vs)	29m 21s
ci (ta6nt, windows-2022, vs)	35m 52s
ci (ta6nt, windows-2022, gcc)	20m 52s
	5h 34m 3s

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