build

nix: use `-ld_new` on macOS #12218

Job	Run time
Check protos	26s
build (ubuntu-latest)	4m 2s
Build jj-lib without Git support	43s
build (macos-14)	3m 5s
build (windows-latest)	8m 57s
Check that MkDocs can build the docs	29s
Check formatting	14s
build (ubuntu-latest, --all-features)	4m 48s
cargo-deny (advisories)	22s
Clippy check	2m 45s
Check that MkDocs can build the docs with Poetry 1.8	25s
cargo-deny (bans licenses sources)	22s
	26m 38s

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