rustbuild: Don't require cross-compiled error index

All architectures use the same errors, no need to cross-compile a version only
to not look at it.

diff --git a/src/bootstrap/doc.rs b/src/bootstrap/doc.rs
index 86f5346bea1fb1558afd3a07306d563462b5c0a1..b9a52a66793dfc604092e1fcc9ba40aa1c94451e 100644 (file)
--- a/src/bootstrap/doc.rs
+++ b/src/bootstrap/doc.rs
@@ -669,11 +669,6 @@ fn run(self, builder: &Builder) {
         let build = builder.build;
         let target = self.target;
 
-        builder.ensure(compile::Rustc {
-            compiler: builder.compiler(0, build.build),
-            target,
-        });
-
         println!("Documenting error index ({})", target);
         let out = build.doc_out(target);
         t!(fs::create_dir_all(&out));