arm: Remove -fno-strict-aliasing

cpu/arm1136/config.mk

cpu/arm1176/config.mk

cpu/arm1176/s3c64xx/config.mk

cpu/arm720t/config.mk

cpu/arm920t/config.mk

cpu/arm925t/config.mk

cpu/arm926ejs/config.mk

cpu/arm926ejs/davinci/config.mk

cpu/arm946es/config.mk

cpu/arm_cortexa8/config.mk

cpu/arm_intcm/config.mk

cpu/ixp/config.mk

cpu/lh7a40x/config.mk

cpu/pxa/config.mk

cpu/s3c44b0/config.mk

cpu/sa1100/config.mk