Revert "Enable TARGET_BUILD_UNBUNDLED in master-art."

Reason for revert: Breaks several test systems that need TARGET_BUILD_UNBUNDLED.
Reverted Changes:
I0a5023be9:Add scaffolding for Runtime (Bionic) SDK.
I085dc634a:Enable TARGET_BUILD_UNBUNDLED in master-art.
I2f68dff3e:Avoid stderr warnings from Bionic in the run tests...
I98f93d501:Drop Bionic from the tree - should now use prebuil...
I9c5c7edd4:Use prebuilt Runtime (Bionic) APEX and SDK (reland...
Id6513d953:Update mainline prebuilts to build 6582130.

Change-Id: If20c9df9f4498f60e24c6a9b1ca3d991292d564f
5 files changed