Remove app.flx from apk (#13647)

bin/internal/engine.version

diff --git a/bin/internal/engine.version b/bin/internal/engine.version
index bd3a97f..07a512f 100644
--- a/bin/internal/engine.version
+++ b/bin/internal/engine.version
@@ -1 +1 @@
-d945976b04cc82d32c9691dae1fc8e4955222b3d
+1c463196773f813a1605e9fe6cdbe24c188054a5

packages/flutter_tools/gradle/flutter.gradle

diff --git a/packages/flutter_tools/gradle/flutter.gradle b/packages/flutter_tools/gradle/flutter.gradle
index e617a7f..3cbd6fa 100644
--- a/packages/flutter_tools/gradle/flutter.gradle
+++ b/packages/flutter_tools/gradle/flutter.gradle
@@ -438,7 +438,6 @@
         return project.copySpec {
             from "${intermediateDir}"
             include "flutter_assets/**" // the working dir and its files
-            include "app.flx"
             if (buildMode != 'debug') {
 	       if (preferSharedLibrary) {
                   include "${intermediateDir}/app.so"