Remove EMBED_LTO_BITCODE #2753

Job	Run time
build_system	49s
duplicates	5s
spell_check	9s
build (gcc-15.deb, --test-libcore)	15m 10s
build (gcc-15.deb, --extended-regex-example-tests)	5m 59s
build (gcc-15.deb, --projects)	11m 41s
build (gcc-15.deb, --extended-rand-tests)	8m 18s
build (gcc-15.deb, --extended-regex-tests)	11m 47s
build (gcc-15-without-int128.deb, --test-libcore)	14m 56s
build (gcc-15.deb, --std-tests)	6m 31s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 59s
build (gcc-15-without-int128.deb, --extended-regex-tests)	11m 13s
build (gcc-15-without-int128.deb, --std-tests)	5m 45s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	14m 5s
build (gcc-15-without-int128.deb, --extended-regex-example-tests)	7m 10s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	14m 58s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	14m 22s
build (gcc-15-without-int128.deb, --extended-rand-tests)	8m 16s
build (gcc-15-without-int128.deb, --projects)	11m 36s
success	3s
	2h 56m 52s

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