Remove ndk_build from platform makefile.

Webrtc used to support both platform build and ndk build in a single makefile.
However, ndk build should be done by gyp, no need to support ndk build in android
makefile, remove NDK_ROOT.

Change-Id: I73c4ab84cec9f4f2d75ec21a50e420f9b076fce4
14 files changed
tree: bf0eea1c4fcfa4e74f10d61edf157f48f1816acc
  1. src/
  2. test/
  3. android-webrtc.mk
  4. Android.mk
  5. MODULE_LICENSE_BSD
  6. NOTICE
  7. TODO