title: Crashlytics does not show stacktrace for NDK reports
body: <p>I compiled the Linphone project. It works most of the time, but sometimes it crashes in the native layer. I followed the instructions in <a href="https://firebase.google.com/docs/crashlytics/ndk-reports" rel="nofollow noreferrer">Crashlytics documentation</a> to enable NDK crash reports. It works, but it does not show the stacktrace of the problem. It shows something like this:
  <a href="https://i.stack.imgur.com/c1yzu.jpg" rel="nofollow noreferrer">Information shown in Crashlytics for native exceptions</a></p>
  
  <p>Any ideas?</p>