CI Ubuntu

Use `import std;` guarded by macro #1127

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Run time

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Job	Run time
build (clang++-13)	30s
build (clang++-14)	32s
build (clang++-15)	27s
build (g++-10)	30s
build (g++-11)	30s
build (g++-12)	27s
	2m 56s