Remove EMBED_LTO_BITCODE #2757

Job	Run time
duplicates	5s
spell_check	11s
build_system	25s
build (gcc-15.deb, --extended-rand-tests)	8m 5s
build (gcc-15.deb, --std-tests)	5m 38s
build (gcc-15.deb, --extended-regex-example-tests)	6m 17s
build (gcc-15.deb, --test-libcore)	14m 32s
build (gcc-15.deb, --extended-regex-tests)	11m 2s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 41s
build (gcc-15.deb, --projects)	11m 1s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	14m 1s
build (gcc-15-without-int128.deb, --extended-rand-tests)	8m 25s
build (gcc-15-without-int128.deb, --extended-regex-example-tests)	6m 24s
build (gcc-15-without-int128.deb, --std-tests)	5m 53s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	14m 8s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	14m 4s
build (gcc-15-without-int128.deb, --projects)	10m 58s
build (gcc-15-without-int128.deb, --extended-regex-tests)	11m 53s
build (gcc-15-without-int128.deb, --test-libcore)	14m 28s
success	4s
	2h 51m 15s

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