The libskia target exports all of its public includes directories so
redefining them here is redundant. Also this cleans up and makes it
obvious where the framework is making using of private Skia headers.
Change-Id: Ie7ecc9ddd3df780bed6b9af54ba58ca58274e043
AndroidRuntimeBase (exported by libandroid_runtime_base.so) is all you need
to link against to gain the ability to do AndroidRuntimeBase::getJNIEnv()
thus minimizing build dependencies.
Change-Id: Ia7f0c94c8c02b974c068e0db34774827f96aa95b
