clean up master Makefile a bit
clean up master Makefile a bit

	. a bit more abstraction (macros) and less duplication
	. also build and install csu, libc, then rest of libraries
	  for future dependency

veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi