trying to fix windows build #27

Job	Run time
macOS / release / homebrew-clang	5m 25s
macOS / debug / homebrew-clang	4m 22s
macOS / release / system-clang	3m 55s
macOS / debug / system-clang	4m 24s
Windows / release / msvc	26m 31s
Windows / release / clang-cl	28m 1s
Windows / release / llvm	24m 15s
Windows / debug / msvc	26m 7s
Windows / debug / clang-cl	24m 16s
Windows / debug / llvm	29m 31s
	2h 56m 47s

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