Put unwinding support behind the unwinding cargo feature #1331

Job	Run time
abi_cafe (ubuntu-latest, x86_64-unknown-linux-gnu)	3m 55s
abi_cafe (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	4m 17s
abi_cafe (macos-13, x86_64-apple-darwin)	7m 13s
abi_cafe (windows-latest, x86_64-pc-windows-msvc)	8m 31s
abi_cafe (macos-latest, aarch64-apple-darwin)	3m 50s
	27m 46s

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