feature: add an unused-libs alias #34459

Job	Run time
Nix Tests (ubuntu-latest)	6m 7s
Nix Build (macos-latest)	10m 10s
Nix Build (ubuntu-latest)	1m 8s
Documentation	42s
Format	1m 11s
Nix Build 4.08 (ubuntu-latest)	52s
Bootstrap (ubuntu-latest)	21s
Cygwin Build	2m 39s
Build (ocaml-base-compiler.5.3.0,system-mingw, windows-latest, true)	11m 53s
Build (5.3.x, macos-latest, true)	15m 59s
Build (5.3.x, ubuntu-latest, true)	8m 22s
Build (ocaml-compiler.5.3.0,system-msvc, windows-latest, true)	9m 34s
Build (ocaml-variants.5.5.0+trunk, ubuntu-latest)	1m 32s
Build (5.4.x, macos-15-intel)	5m 28s
Build (ocaml-variants.4.14.2+options,ocaml-option-32bit, ubuntu-latest, true)	4m 19s
Build (4.14.x, ubuntu-latest)	1m 27s
Build (4.14.x, macos-latest)	2m 30s
Wasm_of_ocaml	4m 3s
Coq 8.16.1	2m 6s
Build microbenchmarks	1m 58s
Create local opam switch (ubuntu-latest, 5)	4m 42s
Create local opam switch (macos-latest, 5)	10m 5s
OxCaml	19m 33s
	2h 6m 41s

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