Rollup merge of rust-lang#45669 - cardoe:metadata, r=kennytm

add Cargo metadata to libstd

Add license and repository metadata to libstd

Author: kennytm

src/libstd/Cargo.toml

@@ -3,6 +3,9 @@ authors = ["The Rust Project Developers"]
 name = "std"
 version = "0.0.0"
 build = "build.rs"
+license = "MIT/Apache-2.0"
+repository = "https://github.com/rust-lang/rust.git"
+description = "The Rust Standard Library"
 
 [lib]
 name = "std"