seq: add f128 code paths #3966

Job	Run time
Build the fuzzers	2m 33s
Run the fuzzers (fuzz_test, true)	2m 27s
Run the fuzzers (fuzz_date, false)	2m 31s
Run the fuzzers (fuzz_expr, true)	2m 37s
Run the fuzzers (fuzz_printf, false)	1m 27s
Run the fuzzers (fuzz_echo, true)	2m 39s
Run the fuzzers (fuzz_seq, false)	5m 13s
Run the fuzzers (fuzz_sort, false)	1m 30s
Run the fuzzers (fuzz_wc, false)	1m 48s
Run the fuzzers (fuzz_cut, false)	1m 22s
Run the fuzzers (fuzz_split, false)	1m 31s
Run the fuzzers (fuzz_tr, false)	1m 32s
Run the fuzzers (fuzz_env, false)	1m 35s
Run the fuzzers (fuzz_parse_glob, true)	2m 16s
Run the fuzzers (fuzz_parse_size, true)	2m 12s
Run the fuzzers (fuzz_parse_time, true)	2m 14s
Run the fuzzers (fuzz_seq_parse_number, true)	2m 14s
	37m 41s

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