BitHacks: fix MSVC build when /Zc:__cplusplus is not set on client side #154

Job	Run time
build-ios	8m 50s
build-experimental (windows-latest)	1m 43s
build (windows-latest)	5m 16s
build-experimental (ubuntu-latest)	54s
build-android	4m 7s
build-kn	3m 33s
build (ubuntu-latest)	1m 52s
build-experimental (macos-13)	1m 45s
build (macos-13)	3m 16s
build-python (3.12, ubuntu-latest)	58s
build-rust (ubuntu-latest)	2m 31s
build-python (3.12, macos-13)	1m 40s
build-ubuntu-sanitize	3m 33s
build-rust (macos-13)	4m 57s
build-wasm	1m 22s
build-python (3.12, windows-latest)	2m 43s
build-rust (windows-latest)	3m 38s
build-winrt	1m 5s
	53m 43s

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