Simplify lf handling #3219

Job	Run time
gcc_build	11m 47s
github_20 (g++-12, Debug)	26m 56s
github_20 (g++-12, Release)	25m 2s
ci_test_compilers_gcc (8)	11m 47s
ci_test_compilers_clang (3.8)	18s
ci_test_compilers_gcc (9)	12m 35s
ci_test_compilers_clang (3.9)	1s
ci_test_compilers_gcc (10)	13m 26s
ci_test_compilers_gcc2 (12)	17m 59s
ci_test_compilers_clang (4)	1s
ci_test_compilers_gcc (11)	14m 19s
ci_test_compilers_gcc2 (latest)	18m 22s
ci_test_compilers_clang (5)	1s
ci_test_compilers_gcc (12)	13m 47s
ci_test_compilers_clang (6)	1s
ci_test_compilers_gcc (latest)	14m 17s
ci_test_compilers_clang (7)	1s
clang_14_build	39m 34s
ci_test_compilers_clang (8)	1s
gcc_build_no_deprecated	11m 45s
gcc_build11b	1h 11m 18s
gcc_build12	15m 55s
ci_test_compilers_clang (9)	1s
ci_test_compilers_clang (10)	4m 51s
ci_test_compilers_clang (11)	5m 11s
ci_test_compilers_clang2 (13)	11m 55s
ci_test_compilers_clang (12)	4m 37s
ci_test_compilers_clang2 (15-bullseye)	11m 14s
ci_test_compilers_clang (13)	3m 52s
ci_test_compilers_clang (14)	53s
ci_test_compilers_clang (15-bullseye)	50s
	6h 2m 37s

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