Consistently adjust xwin dir canonicalization (#129) #415

Job	Run time
Build Docker Image	27s
linux (x86_64-unknown-linux-musl, x86_64-musl)	2m 15s
windows (x64, x86_64-pc-windows-msvc)	3m 58s
linux (i686-unknown-linux-musl, i686-musl)	2m 14s
macos	2m 53s
windows (x86, i686-pc-windows-msvc)	3m 54s
linux (aarch64-unknown-linux-musl, aarch64-musl)	2m 15s
linux (armv7-unknown-linux-musleabihf, armv7-musleabihf)	2m 24s
linux (armv7-unknown-linux-musleabi, armv7-musleabi)	2m 13s
Release	0s
	22m 33s

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