Put unwinding support behind the unwinding cargo feature #1327

Job	Run time
abi_cafe (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	5m 51s
abi_cafe (macos-latest, aarch64-apple-darwin)	4m 6s
abi_cafe (macos-13, x86_64-apple-darwin)	7m 2s
abi_cafe (windows-latest, x86_64-pc-windows-msvc)	10m 2s
abi_cafe (ubuntu-latest, x86_64-unknown-linux-gnu)	4m 48s
	31m 49s

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