track own android/build

AOKP's build is so cruel that it does not allow unofficial builders like us to compile AOKP
(frankly speaking this is so not very fair)

anyways we resort to using our own directory

Change-Id: Id7465d842e6c8b288fe164627bcc0a58e44ec9e8
Signed-off-by: ChampionSwimmer <android@championswimmer.tk>