build/core: Add linaro_compilerchecks.mk

Add linaro_compilerchecks.mk, allowing to run some checks on the
compiler version and supported flags before setting them

Change-Id: I96e1277e74c0ea3457677bef39644aaece01f653
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
Signed-off-by: anerik <anerikgames@gmail.com>

Conflicts:
	core/linaro_compilerchecks.mk