Add add1, sub1 and abs to cptypes #170

Job	Run time
ci (tpb, ubuntu-22.04, --pb --threads --enable-libffi, test-some-fast)	28m 4s
ci (a6osx, macos-12)	14m 1s
ci (ta6osx, macos-12)	21m 38s
ci (i3le, ubuntu-22.04)	11m 36s
ci (ti3le, ubuntu-22.04)	14m 30s
ci (a6le, ubuntu-22.04)	8m 58s
ci (ta6le, ubuntu-22.04, CFLAGS+=-std=gnu89)	11m 57s
ci (ta6le, ubuntu-22.04, reboot, -m=ta6le --force, re.boot SCHEME="chezscheme", test-some-fast)	8m 27s
ci (i3nt, windows-2022, vs)	11m 26s
ci (ti3nt, windows-2022, vs)	14m 20s
ci (a6nt, windows-2022, vs)	13m 8s
ci (ta6nt, windows-2022, vs)	15m 31s
ci (ta6nt, windows-2022, gcc, CFLAGS+=-std=gnu89)	13m 49s
	3h 7m 25s

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