Do not use UBSAN library on HOST or AUX targets

AUX modules are not necessarily using the same toolchain
as the TARGET modules. they don't have to depend on
this library.

Change-Id: Ib50cf0eb26c257ae3eb69a43aa1a12c41d5d39b0
Signed-off-by: Alexey Polyudov <apolyudov@google.com>