[PATCH] perf: fix building error in x86_64

[He Kuang]

When build with ARCH=x86_64, perf failed to compile with following error:

tests/builtin-test.o:(.data+0x158): undefined reference to `test__perf_time_to_tsc'
collect2: error: ld returned 1 exit status
Makefile.perf:632: recipe for target 'perf' failed
...

Which is caused commit c6e5e9fbc3ea1 ("perf tools: Fix building error
in x86_64 when dwarf unwind is on"), ARCH test in Makefile.perf
conflicts with tests/builtin-test.c's __x86_64__.
To x86/x86_64 platform, ARCH should always override to x86 while
IS_64_BIT stands for the actual architecture.

Signed-off-by: He Kuang <hekuang@xxxxxxxxxx>
---
 tools/perf/config/Makefile.arch | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/config/Makefile.arch b/tools/perf/config/Makefile.arch
index ff95a68..8c6214d 100644
--- a/tools/perf/config/Makefile.arch
+++ b/tools/perf/config/Makefile.arch
@@ -14,7 +14,7 @@ ifeq ($(RAW_ARCH),i386)
 endif
 
 ifeq ($(RAW_ARCH),x86_64)
-  ARCH ?= x86
+  override ARCH := x86
 
   ifneq (, $(findstring m32,$(CFLAGS)))
     RAW_ARCH := x86_32
-- 
2.2.0.33.gc18b867

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