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Fix UMFPACK compilation errors in Visual Studio 2017 #1233

Job	Run time
mingw (MINGW64)	22m 54s
mingw (MINGW32)	22m 43s
mingw (UCRT64)	20m 2s
mingw (CLANG64)	25m 29s
ubuntu (gcc with CUDA with OpenMP, both)	8m 58s
ubuntu (gcc without CUDA with OpenMP, both)	7m 29s
ubuntu (clang with CUDA with OpenMP, both)	10m 19s
ubuntu (clang without CUDA with OpenMP, both)	8m 5s
ubuntu (gcc without CUDA without OpenMP, )	6m 31s
ubuntu (gcc with CUDA with OpenMP, static)	10m 53s
	2h 23m 23s

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