path: fix normalization of Windows device paths missing colon #4286

Job	Run time
Build slim tarball	2m 7s
aarch64-linux: with shared libraries	17m 52s
aarch64-darwin: with shared libraries	21m 14s
x86_64-linux: with shared libraries	22m 3s
x86_64-darwin: with shared libraries	36m 38s
	1h 39m 54s

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