[IA64] Makefile: Fix to make ccache/distcc happy.

the (tested) patch below fixes ccache/distcc-assisted building of the
ia64 tree. (CC is "ccache distcc gcc" in that case, not a simple
one-word "gcc" - this confused the check-gas and toolchain-flags
scripts.)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/Makefile

@@ -24,8 +24,8 @@ cflags-y	:= -pipe $(EXTRA) -ffixed-r13 -mfixed-range=f12-f15,f32-f127 \
 CFLAGS_KERNEL	:= -mconstant-gp
 
 GCC_VERSION     := $(call cc-version)
-GAS_STATUS	= $(shell $(srctree)/arch/ia64/scripts/check-gas $(CC) $(OBJDUMP))
-CPPFLAGS += $(shell $(srctree)/arch/ia64/scripts/toolchain-flags $(CC) $(OBJDUMP) $(READELF))
+GAS_STATUS	= $(shell $(srctree)/arch/ia64/scripts/check-gas "$(CC)" "$(OBJDUMP)")
+CPPFLAGS += $(shell $(srctree)/arch/ia64/scripts/toolchain-flags "$(CC)" "$(OBJDUMP)" "$(READELF)")
 
 ifeq ($(GAS_STATUS),buggy)
 $(error Sorry, you need a newer version of the assember, one that is built from	\