build: Add option to disable strict-aliasing optimizations

This is useful for builds that pull in unmodified AOSP repositories
that can't be compiled with strict-aliasing compliance enabled

Change-Id: I0599127b1e113c0799dd8fa92db00b989ebc9bd3
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>