build

CHOLMOD 5.1.0, more updates #635

Job	Run time
macos	1h 32m 36s
mingw (MINGW64)	6m 51s
msvc (with OpenMP)	4m 46s
mingw (MINGW32)	8m 39s
msvc (without OpenMP)	5m 25s
ubuntu (gcc with CUDA with OpenMP)	5m 51s
mingw (CLANG64)	8m 50s
ubuntu (gcc without CUDA with OpenMP)	3m 34s
mingw (CLANG32)	8m 5s
ubuntu (clang with CUDA with OpenMP)	6m 28s
ubuntu (clang without CUDA with OpenMP)	3m 50s
ubuntu (gcc without CUDA without OpenMP)	3m 32s
	2h 38m 27s

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