ci: Don't set `compiler-builtins-no-f16-f128` #2913

Job	Run time
duplicates	5s
build_system	23s
spell_check	10s
build (gcc-15.deb, --std-tests)	5m 51s
build (gcc-15.deb, --test-libcore)	16m 38s
build (gcc-15.deb, --extended-rand-tests)	8m 44s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	12m 47s
build (gcc-15.deb, --extended-regex-example-tests)	6m 24s
build (gcc-15-without-int128.deb, --test-libcore)	16m 27s
build (gcc-15.deb, --projects)	10m 52s
build (gcc-15-without-int128.deb, --extended-rand-tests)	8m 27s
build (gcc-15.deb, --extended-regex-tests)	11m 22s
build (gcc-15-without-int128.deb, --std-tests)	6m 2s
build (gcc-15-without-int128.deb, --extended-regex-tests)	11m 29s
build (gcc-15-without-int128.deb, --extended-regex-example-tests)	7m 33s
build (gcc-15.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	13m 55s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	13m 32s
build (gcc-15-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	14m 17s
build (gcc-15-without-int128.deb, --projects)	12m 16s
success	4s
	2h 57m 18s

Provide feedback