Disable the LTO warning for now #2371

Job	Run time
build_system	45s
duplicates	5s
build (gcc-13.deb, --mini-tests)	6m 21s
build (gcc-13.deb, --std-tests)	5m 59s
build (gcc-13.deb, --test-libcore)	14m 49s
build (gcc-13.deb, --extended-rand-tests)	8m 37s
build (gcc-13.deb, --extended-regex-example-tests)	7m 2s
build (gcc-13.deb, --extended-regex-tests)	12m 23s
build (gcc-13.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	11m 36s
build (gcc-13.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	11m 24s
build (gcc-13.deb, --projects)	11m 46s
build (gcc-13-without-int128.deb, --mini-tests)	6m 4s
build (gcc-13-without-int128.deb, --std-tests)	6m 7s
build (gcc-13-without-int128.deb, --test-libcore)	14m 34s
build (gcc-13-without-int128.deb, --extended-rand-tests)	8m 31s
build (gcc-13-without-int128.deb, --extended-regex-example-tests)	6m 39s
build (gcc-13-without-int128.deb, --extended-regex-tests)	12m 24s
build (gcc-13-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	11m 23s
build (gcc-13-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	11m 25s
build (gcc-13-without-int128.deb, --projects)	12m 3s
	2h 59m 57s

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