ndk-build is intended to be launched from the application directory,
not the jni directory. Clarify the path in the comments.
Change-Id: Ie0faa89a13d967088a4fd2fd1c647962a9c04217
# Android.mk file in the libvpx directory:
# LOCAL_PATH := $(call my-dir)
# include $(CLEAR_VARS)
-# include libvpx/build/make/Android.mk
+# include jni/libvpx/build/make/Android.mk
#
# There are currently two TARGET_ARCH_ABI targets for ARM.
# armeabi and armeabi-v7a. armeabi-v7a is selected by creating an