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Use `_WIN32` only to check for windows #1041

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Run time

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Job	Run time
build (macos-13, clang++)	1m 14s
build (ubuntu-22.04, g++)	27s
build (ubuntu-24.04, clang++)	2m 47s
build (ubuntu-24.04, g++)	2m 23s
build (ubuntu-22.04, clang++)	35s
build (macos-14, clang++)	31s
build (macos-15, clang++)	29s
	8m 26s