build

nix: use `-ld_new` on macOS #12160

Job	Run time
build (ubuntu-latest)	3m 56s
Build jj-lib without Git support	41s
cargo-deny (advisories)	23s
build (macos-14)	4m 11s
cargo-deny (bans licenses sources)	23s
build (windows-latest)	8m 32s
Check protos	36s
build (ubuntu-latest, --all-features)	4m 58s
Clippy check	2m 39s
Check that MkDocs can build the docs	24s
Check that MkDocs can build the docs with Poetry 1.8	21s
Check formatting	14s
	27m 18s

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