Enable user creation and multi-user UI

Change-Id: I7e05e1dee8ddbfd2a7e14ffd045f90ad701e8fde
build: Avoid poisoning the host binaries with bad ABIs

the vector class symbols are only needed on the target. Don't inject
(or expect) them into the host binaries to avoid multi-device build
conflicts and ABI breakage

Change-Id: I628140d913219cf008926b93c9c0725a209ec8b4
Merge remote-tracking branch 'cm/cm-12.0' into HEAD