Stop ignoring the feature -sse #2577

Job	Run time
duplicates	3s
build (gcc-15.deb, --std-tests)	8m 9s
build (gcc-15.deb, --test-libcore)	16m 46s
build_system	26s
build (gcc-15.deb, --extended-rand-tests)	8m 42s
build (gcc-15.deb, --extended-regex-example-tests)	6m 41s
build (gcc-15.deb, --extended-regex-tests)	13m 37s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	11m 44s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	13m 6s
build (gcc-15.deb, --projects)	11m 35s
build (gcc-15-without-int128.deb, --std-tests)	8m 25s
build (gcc-15-without-int128.deb, --test-libcore)	15m 16s
build (gcc-15-without-int128.deb, --extended-rand-tests)	9m 55s
build (gcc-15-without-int128.deb, --extended-regex-example-tests)	7m 48s
build (gcc-15-without-int128.deb, --extended-regex-tests)	14m 21s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 25s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	12m 23s
build (gcc-15-without-int128.deb, --projects)	11m 48s
success	1s
	3h 4m 11s

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