Version of Jack used to compile a module can now be control from
a dedicated mk located in prebuilts/sdk/tools
Bug: 24564814
Change-Id: Ie8120c97e0fa10953d4d015afd27aacfac80e5b6
Set LOCAL_BUILT_MODULE of static java libraries when Jack is enabled
to classes.jack instead of javalib.jar.
This allows that running mm in those libraries will build classes.jack
instead of the jar.
Change-Id: I96b4b227848e971df96331b3f0cc731e856be349