Use -Zbuild-dir-new-layout #1739

Job	Run time
abi_cafe (macos-latest, aarch64-apple-darwin)	5m 54s
abi_cafe (windows-latest, x86_64-pc-windows-msvc)	9m 31s
abi_cafe (ubuntu-latest, x86_64-unknown-linux-gnu)	6m 51s
abi_cafe (ubuntu-24.04-arm, aarch64-unknown-linux-gnu)	5m 27s
abi_cafe (macos-15-intel, x86_64-apple-darwin)	11m 13s
	38m 56s

Provide feedback