Makefile: add CCACHE and CC tweaks
vfp: hardfloat

Signed-off-by: Dennis Rassmann <showp1984@gmail.com>

Conflicts:
	arch/arm/vfp/Makefile
Enable pipe flag.

Signed-off-by: franciscofranco <franciscofranco.1990@gmail.com>
Signed-off-by: Francisco Franco <franciscofranco.1990@gmail.com>
fix interactive for gcc 4.9