Delete unused fields on Crate struct

src/bootstrap/lib.rs

@@ -270,14 +270,9 @@ pub struct Build {
 #[derive(Debug)]
 struct Crate {
     name: Interned<String>,
-    version: String,
     deps: HashSet<Interned<String>>,
     id: String,
     path: PathBuf,
-    doc_step: String,
-    build_step: String,
-    test_step: String,
-    bench_step: String,
 }
 
 impl Crate {

src/bootstrap/metadata.rs

@@ -20,7 +20,6 @@ struct Output {
 struct Package {
     id: String,
     name: String,
-    version: String,
     source: Option<String>,
     manifest_path: String,
 }
@@ -84,12 +83,7 @@ fn build_krate(features: &str, build: &mut Build, resolves: &mut Vec<ResolveNode
             let mut path = PathBuf::from(package.manifest_path);
             path.pop();
             build.crates.insert(name, Crate {
-                build_step: format!("build-crate-{}", name),
-                doc_step: format!("doc-crate-{}", name),
-                test_step: format!("test-crate-{}", name),
-                bench_step: format!("bench-crate-{}", name),
                 name,
-                version: package.version,
                 id: package.id,
                 deps: HashSet::new(),
                 path,