New warning when building android app with gradle : <p>Yesterday it was fine, today it shows this warning when I clean or build the project:</p>

<blockquote>
  <p>WARNING: Ignoring Android API artifact
  com.google.android:android:2.1_r1 for appDebug WARNING: Ignoring Android
  API artifact com.google.android:android:2.1_r1 for appRelease</p>
</blockquote>

<p>I think it was caused by an update of the gradle plugin for android.</p>

<p>Anyone knows what it means ?</p>
