tree bf0eea1c4fcfa4e74f10d61edf157f48f1816acc
parent 49b9845aea12d85dd92eff2604a6756db08cd855
author leozwang <leozwang@google.com> 1399502688 -0700
committer leozwang <leozwang@google.com> 1399502688 -0700

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