build-gnu.sh: remove workaround for timeout/yes #18044

Job	Run time
Build the fuzzers	2m 57s
Build and test uufuzz examples	1m 19s
Fuzz (fuzz_seq_parse_number, false)	1m 19s
Fuzz (fuzz_non_utf8_paths, true)	2m 15s
Fuzz (fuzz_cksum, false)	1m 13s
Fuzz (fuzz_cut, false)	1m 19s
Fuzz (fuzz_wc, false)	1m 7s
Fuzz (fuzz_expr, true)	2m 7s
Fuzz (fuzz_test, true)	2m 21s
Fuzz (fuzz_echo, true)	2m 6s
Fuzz (fuzz_dirname, true)	2m 14s
Fuzz (fuzz_parse_glob, true)	2m 12s
Fuzz (fuzz_seq, false)	1m 48s
Fuzz (fuzz_printf, true)	2m 11s
Fuzz (fuzz_parse_time, false)	1m 43s
Fuzz (fuzz_tr, false)	2m 13s
Fuzz (fuzz_split, false)	1m 14s
Fuzz (fuzz_env, false)	1m 3s
Fuzz (fuzz_parse_size, false)	1m 18s
Fuzz (fuzz_sort, false)	2m 4s
Fuzz (fuzz_date, true)	2m 10s
Fuzzing Summary	9s
	38m 22s

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