Makefile: Compile with optimized SaberMod GCC 4.9 toolchain

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
arm: Makefile: Compile with pipe flag

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
Makefile: Optimize KBUILD and linker

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>
ghost: Optimize for speed instead

Signed-off-by: Zhao Wei Liew <zhaoweiliew@gmail.com>