Enabling building with NEON on ARM64

This patch enables NEON on ARM64 platform. Passed building both on
Android ARMv7 and Android ARM64.

BUG=3580
R=andrew@webrtc.org, jridges@masque.com

Review URL: https://webrtc-codereview.appspot.com/25069004

Patch from Zhongwei Yao <zhongwei.yao@arm.com>.

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7751 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/audio_processing/audio_processing.gypi b/webrtc/modules/audio_processing/audio_processing.gypi
index 3ac87b8..b2c9bb4 100644
--- a/webrtc/modules/audio_processing/audio_processing.gypi
+++ b/webrtc/modules/audio_processing/audio_processing.gypi
@@ -138,7 +138,7 @@
         ['target_arch=="ia32" or target_arch=="x64"', {
           'dependencies': ['audio_processing_sse2',],
         }],
-        ['(target_arch=="arm" and arm_version==7) or target_arch=="armv7"', {
+        ['(target_arch=="arm" and arm_version==7) or target_arch=="armv7" or target_arch=="arm64"', {
           'dependencies': ['audio_processing_neon',],
         }],
         ['target_arch=="mipsel" and mips_arch_variant!="r6" and android_webview_build==0', {
@@ -197,7 +197,7 @@
         },
       ],
     }],
-    ['(target_arch=="arm" and arm_version==7) or target_arch=="armv7"', {
+    ['(target_arch=="arm" and arm_version==7) or target_arch=="armv7" or target_arch=="arm64"', {
       'targets': [{
         'target_name': 'audio_processing_neon',
         'type': 'static_library',
@@ -212,7 +212,7 @@
           'ns/nsx_core_neon.c',
         ],
         'conditions': [
-          ['OS=="android" or OS=="ios"', {
+          ['(OS=="android" or OS=="ios") and target_arch!="arm64"', {
             'dependencies': [
               '<(gen_core_neon_offsets_gyp):*',
             ],