cksum: implement check (Closes: #5705) #3141

Job	Run time
Build the fuzzers	2m 17s
Run the fuzzers (fuzz_test, true)	2m 17s
Run the fuzzers (fuzz_date, false)	2m 14s
Run the fuzzers (fuzz_expr, true)	2m 20s
Run the fuzzers (fuzz_printf, false)	1m 28s
Run the fuzzers (fuzz_echo, true)	2m 19s
Run the fuzzers (fuzz_seq, false)	1m 20s
Run the fuzzers (fuzz_sort, false)	1m 34s
Run the fuzzers (fuzz_wc, false)	1m 25s
Run the fuzzers (fuzz_cut, false)	1m 28s
Run the fuzzers (fuzz_split, false)	1m 38s
Run the fuzzers (fuzz_tr, false)	1m 33s
Run the fuzzers (fuzz_env, false)	1m 24s
Run the fuzzers (fuzz_parse_glob, true)	2m 15s
Run the fuzzers (fuzz_parse_size, true)	2m 6s
Run the fuzzers (fuzz_parse_time, true)	2m 16s
Run the fuzzers (fuzz_seq_parse_number, true)	2m 14s
	32m 8s

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