Re-enable `xwin test` on CI #441

Job	Run time
macos	51s
windows (x64, x86_64-pc-windows-msvc)	3m 26s
windows (x86, i686-pc-windows-msvc)	3m 42s
Build Docker Image	0s
linux (x86_64-unknown-linux-musl, x86_64-musl)	1m 21s
linux (i686-unknown-linux-musl, i686-musl)	53s
linux (aarch64-unknown-linux-musl, aarch64-musl)	53s
linux (armv7-unknown-linux-musleabihf, armv7-musleabihf)	53s
linux (armv7-unknown-linux-musleabi, armv7-musleabi)	1m 20s
Release	0s
	13m 19s

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