tool clean up

Author: hathach

Makefile

@@ -40,9 +40,6 @@ MERGED_FILE = $(OUT_FILE)_$(SD_NAME)_$(SD_VERSION)
 CROSS_COMPILE = arm-none-eabi-
 CC      = $(CROSS_COMPILE)gcc
 AS      = $(CROSS_COMPILE)as
-AR      = $(CROSS_COMPILE)ar -r
-NM      = $(CROSS_COMPILE)nm
-OBJDUMP = $(CROSS_COMPILE)objdump
 OBJCOPY = $(CROSS_COMPILE)objcopy
 SIZE    = $(CROSS_COMPILE)size
 GDB     = $(CROSS_COMPILE)gdb