title: Getting warning "NDK is missing a 'platforms" directory.' with no NDK
body: <p>I've got a project that only uses the Android SDK, not the NDK, but I'm getting warnings whenever I build with gradle about the NDK:</p>
  
  <p><code>NDK is missing a "platforms" directory.
  If you are using NDK, verify the ndk.dir is set to a valid NDK directory.  It is currently set to /usr/local/opt/android-sdk/ndk-bundle.
  If you are not using NDK, unset the NDK variable from ANDROID_NDK_HOME or local.properties to remove this warning.</code></p>
  
  <p>Seems like a pretty clear warning. I'm not using the ndk, so there is no <code>ndk-bundle</code> in my <code>android-sdk</code>. The issue is that I don't have an <code>ANDROID_NDK_HOME</code> set, and my <code>local.properties</code> file (which appears to be generated by Android Studio) doesn't set the NDK:</p>
  
  <p><code>sdk.dir=/usr/local/opt/android-sdk</code></p>
  
  <p>I do have an ANDROID_HOME environment variable:</p>
  
  <p><code>ANDROID_HOME=/usr/local/opt/android-sdk</code></p>
  
  <p>System is a mac, but we seem to get the same issue in Docker. Anyone know how to get rid of this warning?</p>