powerpc: Get rid of CROSS32{AS,LD,OBJCOPY}

CROSS32AS and CROSS32LD are never used (instead, CROSS32CC is used
with proper command line options).

CROSS32OBJCOPY isn't used anymore either, since the "wrapper" stuff
was added.

Remove these unused variables.
Signed-off-by: NSegher Boessenkool <segher@kernel.crashing.org>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

arch/powerpc/Makefile

@@ -18,22 +18,16 @@ HAS_BIARCH	:= $(call cc-option-yn, -m32)
 CROSS32_COMPILE ?=
 
 CROSS32CC		:= $(CROSS32_COMPILE)gcc
-CROSS32AS		:= $(CROSS32_COMPILE)as
-CROSS32LD		:= $(CROSS32_COMPILE)ld
 CROSS32AR		:= $(CROSS32_COMPILE)ar
-CROSS32OBJCOPY		:= $(CROSS32_COMPILE)objcopy
 
 ifeq ($(HAS_BIARCH),y)
 ifeq ($(CROSS32_COMPILE),)
 CROSS32CC	:= $(CC) -m32
-CROSS32AS	:= $(AS) -a32
-CROSS32LD	:= $(LD) -m elf32ppc
-CROSS32OBJCOPY	:= $(OBJCOPY)
 CROSS32AR	:= GNUTARGET=elf32-powerpc $(AR)
 endif
 endif
 
-export CROSS32CC CROSS32AS CROSS32LD CROSS32AR CROSS32OBJCOPY
+export CROSS32CC CROSS32AR
 
 ifeq ($(CROSS_COMPILE),)
 KBUILD_DEFCONFIG := $(shell uname -m)_defconfig