Don't add x86 nor x64 when building a local engine in debug mode (#44302)

diff --git a/packages/flutter_tools/gradle/flutter.gradle b/packages/flutter_tools/gradle/flutter.gradle
index d8daab9..24d4a11 100644
--- a/packages/flutter_tools/gradle/flutter.gradle
+++ b/packages/flutter_tools/gradle/flutter.gradle
@@ -220,7 +220,7 @@
 
         List<String> platforms = getTargetPlatforms().collect()
         // Debug mode includes x86 and x64, which are commonly used in emulators.
-        if (flutterBuildMode == "debug") {
+        if (flutterBuildMode == "debug" && !useLocalEngine()) {
             platforms.add("android-x86")
             platforms.add("android-x64")
         }