title: difference between ndk-bundle and android-ndk-r15c
body: <p>are there any difference between ndk-bundle obtained donloading the ndk from SDK manager and android-ndk-r15c from android developers?
  I'm not able to compile a project cloned from git-hub, in the description is write that I need android-ndk-r8c... I'm using ndk-bundle, is the same??</p>