Remove EMBED_LTO_BITCODE #2760

Job	Run time
spell_check	8s
duplicates	5s
build_system	24s
build (gcc-15.deb, --extended-regex-tests)	11m 50s
build (gcc-15.deb, --extended-rand-tests)	8m 22s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	13m 50s
build (gcc-15.deb, --extended-regex-example-tests)	6m 29s
build (gcc-15.deb, --std-tests)	5m 42s
build (gcc-15.deb, --projects)	10m 39s
build (gcc-15.deb, --test-libcore)	14m 59s
build (gcc-15-without-int128.deb, --extended-regex-example-tests)	6m 25s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	13m 57s
build (gcc-15-without-int128.deb, --projects)	11m 0s
build (gcc-15-without-int128.deb, --std-tests)	6m 2s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 52s
build (gcc-15-without-int128.deb, --extended-rand-tests)	8m 8s
build (gcc-15-without-int128.deb, --test-libcore)	14m 52s
build (gcc-15-without-int128.deb, --extended-regex-tests)	11m 14s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 51s
success	3s
	2h 51m 52s

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