build

CHOLMOD 5.1.0 #645

Job	Run time
mingw (MINGW64)	7m 20s
mingw (MINGW32)	7m 21s
mingw (CLANG64)	10m 28s
macos	12m 34s
mingw (CLANG32)	6m 6s
msvc (with OpenMP)	5m 53s
msvc (without OpenMP)	3m 43s
ubuntu (gcc with CUDA with OpenMP)	4m 40s
ubuntu (gcc without CUDA with OpenMP)	2m 35s
ubuntu (clang with CUDA with OpenMP)	4m 48s
ubuntu (clang without CUDA with OpenMP)	2m 51s
ubuntu (gcc without CUDA without OpenMP)	3m 23s
	1h 11m 42s

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