updated .gitignore

Author: pinpong

flutter_vlc_player/example/.gitignore

@@ -57,6 +57,7 @@ unlinked_spec.ds
 # Android related
 **/android/**/gradle-wrapper.jar
 **/android/.gradle
+**/android/app/.cxx
 **/android/captures/
 **/android/gradlew
 **/android/gradlew.bat