Fix clippy: Disable warning large_enum_variant

Author: tesuji

src/cli/errors.rs

@@ -1,3 +1,4 @@
+#![allow(clippy::large_enum_variant)]
 #![allow(dead_code)]
 
 use crate::rustup_mode::CompletionCommand;

src/errors.rs

@@ -1,3 +1,5 @@
+#![allow(clippy::large_enum_variant)]
+
 use crate::component_for_bin;
 use crate::dist::manifest::{Component, Manifest};
 use crate::dist::temp;