build

nix: use `-ld_new` on macOS #12222

Job	Run time
build (ubuntu-latest)	4m 4s
Build jj-lib without Git support	44s
build (macos-14)	3m 7s
build (windows-latest)	7m 24s
Check protos	38s
build (ubuntu-latest, --all-features)	5m 6s
Check formatting	15s
cargo-deny (advisories)	25s
cargo-deny (bans licenses sources)	24s
Check that MkDocs can build the docs	24s
Check that MkDocs can build the docs with Poetry 1.8	20s
Clippy check	2m 22s
	25m 13s

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