am eee1675a: Look for Android.mk in /jni by default.

Merge commit 'eee1675aa40d9fcaae3765370f5331e4002d8dd6'

* commit 'eee1675aa40d9fcaae3765370f5331e4002d8dd6':
  Look for Android.mk in $(APP_PROJECT_PATH)/jni by default.