Fix typo

gcc/rust/ChangeLog:

	* expand/rust-derive.cc (DeriveVisitor::derive): Fix typo

gcc/rust/expand/rust-derive.cc

@@ -65,7 +65,7 @@ derive (Item &item, const Attribute &attr, BuiltinMacro to_derive)
     case BuiltinMacro::PartialOrd:
     case BuiltinMacro::Hash:
     default:
-      rust_sorry_at (attr.get_locus (), "uninmplemented builtin derive macro");
+      rust_sorry_at (attr.get_locus (), "unimplemented builtin derive macro");
       return nullptr;
     };
 }