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use `MAKE` variable when available, which can set `-j` #87

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Run time

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Job	Run time
linux-amd64 (Nim version-1-6)	23m 13s
linux-amd64 (Nim version-2-0)	24m 33s
linux-amd64 (Nim devel)	24m 53s
macos-amd64 (Nim version-1-6)	34m 1s
macos-amd64 (Nim version-2-0)	35m 14s
macos-amd64 (Nim devel)	37m 42s
windows-amd64 (Nim version-1-6)	5m 50s
windows-amd64 (Nim version-2-0)	6m 38s
windows-amd64 (Nim devel)	7m 17s
	3h 19m 21s