use arm only to determine if neon should be build

BUG=307
TESTED=try bots
R=yfriedman@chromium.org

Review URL: https://webrtc-codereview.appspot.com/7009005

git-svn-id: http://libyuv.googlecode.com/svn/trunk@971 16f28f9a-4ce2-e073-06de-1de4eb20be90

README.chromium

@@ -1,6 +1,6 @@
 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 969
+Version: 971
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_  // NOLINT
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 969
+#define LIBYUV_VERSION 971
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_  NOLINT

libyuv.gyp

@@ -14,8 +14,7 @@
     'use_system_libjpeg%': 0,
     'build_neon': 0,
     'conditions': [
-       ['OS == "ios" or
-        (OS == "android" and target_arch == "arm" and arm_version >= 7)', {
+       ['target_arch == "arm" and arm_version >= 7 and (arm_neon == 1 or arm_neon_optional == 1)', {
          'build_neon': 1,
        }],
     ],