Remove runtime NEON detection

webrtc/build/common.gypi

 # Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # This file contains common settings for building WebRTC components.
 
@@ skipping 191 matching lines @@
         'include_internal_audio_device%': 1,
         'include_tests%': 1,
         'restrict_webrtc_logging%': 0,
       }],
       ['OS=="ios"', {
         'build_libjpeg%': 0,
       }],
       ['target_arch=="arm" or target_arch=="arm64" or target_arch=="mipsel"', {
         'prefer_fixed_point%': 1,
       }],
-      ['(target_arch=="arm" and (arm_neon==1 or arm_neon_optional==1)) or target_arch=="arm64"', {
+      ['(target_arch=="arm" and arm_neon==1) or target_arch=="arm64"', {
         'build_with_neon%': 1,
       }],
       ['OS!="ios" and (target_arch!="arm" or arm_version>=7) and target_arch!="mips64el"', {
         'rtc_use_openmax_dl%': 1,
       }, {
         'rtc_use_openmax_dl%': 0,
       }],
     ], # conditions
   },
   'target_defaults': {
@@ skipping 104 matching lines @@
         'defines': [
           'WEBRTC_ARCH_ARM',
         ],
         'conditions': [
           ['arm_version>=7', {
             'defines': ['WEBRTC_ARCH_ARM_V7',],
             'conditions': [
               ['arm_neon==1', {
                 'defines': ['WEBRTC_HAS_NEON',],
               }],
-              ['arm_neon==0 and arm_neon_optional==1', {
-                'defines': ['WEBRTC_DETECT_NEON',],
-              }],
             ],
           }],
         ],
       }],
       ['target_arch=="mipsel" and mips_arch_variant!="r6"', {
         'defines': [
           'MIPS32_LE',
         ],
         'conditions': [
           ['mips_float_abi=="hard"', {
@@ skipping 152 matching lines @@
           # For access to standard POSIXish features, use WEBRTC_POSIX instead
           # of a more specific macro.
           'defines': [
             'WEBRTC_POSIX',
           ],
         }],
       ],
     },
   }, # target_defaults
 }