build/core: Add option to disable C++11 bits

Change-Id: I45294e8c19bf7cdf200b45fbd114ccd75c4e3ca9
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>

Conflicts:
	core/combo/TARGET_linux-arm.mk
Makefile: Make sure gcc is built before system.img in developer-* builds

This is a workaround for make 3.81 not seeing the dependency introduced
in native-toolchain/Android.mk.

Change-Id: Ie64c39c4904f6ca45978802a6494f55c667add84
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>