Teach Linux to use local engine (#31631)

packages/flutter_tools/lib/src/project.dart

diff --git a/packages/flutter_tools/lib/src/project.dart b/packages/flutter_tools/lib/src/project.dart
index 5891c6c..ae8e405 100644
--- a/packages/flutter_tools/lib/src/project.dart
+++ b/packages/flutter_tools/lib/src/project.dart
@@ -599,6 +599,8 @@
 
   Directory get editableHostAppDirectory => project.directory.childDirectory('linux');
 
+  Directory get cacheDirectory => editableHostAppDirectory.childDirectory('flutter');
+
   bool existsSync() => editableHostAppDirectory.existsSync();
 
   /// The Linux project makefile.