fixed XZ kernel compression errors
	modified:   Makefile Makefile: added '--strip-debug'
	modified:   arch/arm/boot/compressed/Makefile trying to fix build error within XZ kernel compression
	modified:   arch/arm/boot/compressed/decompress.c trying to fix build error within XZ kernel compression
	modified:   arch/arm/boot/compressed/piggy.xzkern.S trying to fix build error within XZ kernel compression
	modified:   arch/arm/configs/t0_04_defconfig defconfig: reverted XZ kernel compression, went back to LZMA
	modified:   build.sh added gzip compression for ramdisk