Rework add/sub pointer arithmetic overloading #116

Job	Run time
docker	1m 19s
thirdparty-tests (test_perl)	10m 25s
thirdparty-tests (test_cello)	17s
thirdparty-tests (test_curl)	9m 4s
thirdparty-tests (test_doom)	14s
thirdparty-tests (test_git)	18m 20s
thirdparty-tests (test_libpng)	2m 8s
thirdparty-tests (test_libuev)	48s
thirdparty-tests (test_lua)	27s
thirdparty-tests (test_metalang99)	42s
thirdparty-tests (test_oniguruma_jq)	56s
thirdparty-tests (test_openssh)	5m 1s
thirdparty-tests (test_openssl)	16m 23s
thirdparty-tests (test_php)	6m 29s
thirdparty-tests (test_postgres)	3m 52s
thirdparty-tests (test_python)	25m 45s
thirdparty-tests (test_qbe_hare)	24s
thirdparty-tests (test_sqlite)	3m 28s
thirdparty-tests (test_tinycc)	23s
thirdparty-tests (test_toxcore)	4m 47s
thirdparty-tests (test_toybox)	53s
thirdparty-tests (test_vim)	1m 50s
thirdparty-tests (test_zlib)	14s
thirdparty-tests (test_zstd)	1m 33s
thirdparty-tests (build_gcc)	8m 8s
thirdparty-tests (build_musl)	1m 28s
thirdparty-tests (build_nano)	1m 2s
thirdparty-tests (build_sdl)	1m 35s
thirdparty-tests (build_zig)	8m 48s
	2h 16m 43s

Provide feedback