tac: use temp file for stdin to respect TMPDIR and handle disk-full errors #16810

Job	Run time
Build and test uufuzz examples	1m 14s
Build the fuzzers	2m 39s
Fuzz (fuzz_printf, true)	3m 45s
Fuzz (fuzz_expr, true)	3m 26s
Fuzz (fuzz_date, true)	2m 11s
Fuzz (fuzz_test, true)	2m 6s
Fuzz (fuzz_echo, true)	3m 28s
Fuzz (fuzz_split, false)	2m 11s
Fuzz (fuzz_seq, false)	1m 10s
Fuzz (fuzz_parse_glob, true)	3m 30s
Fuzz (fuzz_seq_parse_number, true)	2m 45s
Fuzz (fuzz_parse_size, true)	2m 33s
Fuzz (fuzz_wc, false)	2m 35s
Fuzz (fuzz_cksum, false)	1m 10s
Fuzz (fuzz_tr, false)	1m 41s
Fuzz (fuzz_env, false)	2m 26s
Fuzz (fuzz_non_utf8_paths, true)	3m 27s
Fuzz (fuzz_cut, false)	1m 4s
Fuzz (fuzz_sort, false)	1m 27s
Fuzz (fuzz_parse_time, true)	1m 19s
Fuzzing Summary	7s
	46m 14s

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