Rollup merge of #55555 - aidanhs:aphs-better-z-ls, r=alexcrichton
Rollup merge of #55555 - aidanhs:aphs-better-z-ls, r=alexcrichton

Make `-Z ls` list the actual filename of external dependencies

The hash is pointless for external consumers - extra_filename is the thing that actually gets used, per https://github.com/rust-lang/rust/blob/ca2639e/src/librustc_metadata/locator.rs#L312-L313

GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust