build: Make sure boot.img depends on the kernel having been built

Change-Id: Ia439ed4079ef912c42aa15cac995741fd6071f1e
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
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>

Conflicts:
	core/combo/select.mk

Conflicts:
	core/combo/select.mk