Build arch/$ARCH/lib/bootm.o depending on CONFIG_CMD_BOOTM

MAKEALL is fine for ppc4xx and mpc85xx.
Run checks were done on our controlcenterd hardware.

Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc>
Signed-off-by: Andy Fleming <afleming@freescale.com>

arch/avr32/lib/Makefile

@@ -30,7 +30,7 @@ LIB	= $(obj)lib$(ARCH).o
 SOBJS-y	+= memset.o
 
 COBJS-y	+= board.o
-COBJS-y	+= bootm.o
+COBJS-$(CONFIG_CMD_BOOTM) += bootm.o
 COBJS-y	+= interrupts.o
 
 SRCS	:= $(SOBJS-y:.o=.S) $(COBJS-y:.o=.c)