remove dependency on os-specific defines #619

Job	Run time
Build and test cmake:gcc9	27s
Build and test cmake:clang15	32s
Build and test cmake:clang15:asan	45s
Build and test cmake:clang15:tsan	47s
Build and test cmake:clang15:ubsan	57s
Build and test cmake:qemu-arm-neon-gcc	1m 8s
Build and test cmake-osx:clang	48s
Build and test cmake-osx:gcc	37s
Build and test cmake-win64:msvc-rel	1m 25s
Build and test cmake-win64:msvc-dbg	1m 15s
Build and test fuzz:clang15	32s
Build and test python3.10:clang15	1m 42s
Build and test python3.10-win	37s
Build and test maven	33s
Build and test bazel:root	29s
Build and test bazel:go	1m 1s
Build and test bazel:java	1m 57s
Build and test bazel:research	20s
Build and test bazel-osx:root	1m 11s
Build and test bazel-osx:go	2m 6s
Build and test bazel-osx:java	2m 25s
Build and test bazel-osx:research	1m 18s
Build and test bazel-win:root	1m 32s
Build and test bazel-win:java	4m 56s
Build and test bazel-win:research	1m 28s
	30m 48s

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