Add a rule for KDE Neon #4211

Job	Run time
build-macos	8m 38s
build-freebsd	15m 11s
build-distros (alpine)	14m 22s
build-distros (archlinux)	15m 46s
build-msys	11m 3s
build-distros (fedora)	11m 4s
build-sanitizers	9m 41s
build-multi-archs	13m 53s
build-distros (gentoo/stage3)	17m 3s
build-sanitizers (-DMOLD_USE_ASAN=On)	12m 30s
build-windows	28m 4s
build-distros (opensuse/tumbleweed)	11m 36s
build-sanitizers (-DMOLD_USE_TSAN=On)	23m 23s
build-distros (ubuntu:22.04)	9m 59s
	3h 22m 13s

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