Create binstubs for executables when activating a package.

sdk/lib/_internal/pub_generated/lib/src/validator/name.dart

Index: sdk/lib/_internal/pub_generated/lib/src/validator/name.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/validator/name.dart b/sdk/lib/_internal/pub_generated/lib/src/validator/name.dart
index 10171e1fb2a799dc96d6d8370efed5bfd46f32e9..96508d104a21697f9467859dff2f3ab151b78389 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/validator/name.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/validator/name.dart
@@ -65,9 +65,8 @@ class NameValidator extends Validator {
   }
   List<String> get _libraries {
     var libDir = path.join(entrypoint.root.dir, "lib");
-    if (!dirExists(libDir)) return [];
     return entrypoint.root.listFiles(
-        beneath: libDir).map(
+        beneath: "lib").map(
             (file) =>
                 path.relative(
                     file,