CI Ubuntu

Use `import std;` guarded by macro #1135

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Run time

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Job	Run time
build (clang++-13)	2m 57s
build (clang++-14)	2m 47s
build (clang++-15)	2m 56s
build (g++-10)	3m 0s
build (g++-11)	2m 54s
build (g++-12)	3m 4s
	17m 38s