Disable cpu detection on arm-neon

Descritpion
Probably it's a bug in vpx script, disable it for now.
Review URL: https://webrtc-codereview.appspot.com/640006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2381 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/third_party/libvpx/source/config/linux/arm-neon/vpx_config.h b/third_party/libvpx/source/config/linux/arm-neon/vpx_config.h
index b604d84..531ba3a 100644
--- a/third_party/libvpx/source/config/linux/arm-neon/vpx_config.h
+++ b/third_party/libvpx/source/config/linux/arm-neon/vpx_config.h
@@ -54,7 +54,7 @@
 #define CONFIG_MD5 1
 #define CONFIG_DEQUANT_TOKENS 0
 #define CONFIG_DC_RECON 0
-#define CONFIG_RUNTIME_CPU_DETECT 1
+#define CONFIG_RUNTIME_CPU_DETECT 0
 #define CONFIG_POSTPROC 1
 #define CONFIG_MULTITHREAD 1
 #define CONFIG_INTERNAL_STATS 0