build

nix: use `-ld_new` on macOS #12220

Job	Run time
Build jj-lib without Git support	44s
build (ubuntu-latest)	4m 12s
Check protos	58s
build (macos-14)	3m 6s
cargo-deny (advisories)	24s
build (windows-latest)	8m 37s
cargo-deny (bans licenses sources)	27s
Clippy check	2m 24s
build (ubuntu-latest, --all-features)	5m 5s
Check that MkDocs can build the docs	20s
Check that MkDocs can build the docs with Poetry 1.8	19s
Check formatting	15s
	26m 51s

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