Fix libvpx's gyp for enabling AVX instructions with MSVC and clang-cl

third_party/libvpx_new/libvpx_srcs_x86_intrinsics.gypi

 # This file is generated. Do not edit.
 # Copyright (c) 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'libvpx_intrinsics_mmx',
       'type': 'static_library',
@@ skipping 89 matching lines @@
         'source/config/<(OS_CATEGORY)/<(target_arch_full)',
         '<(libvpx_source)',
       ],
       'sources': [
         '<(libvpx_source)/vp9/encoder/x86/vp9_diamond_search_sad_avx.c',
       ],
       'cflags': [ '-mavx', ],
       'xcode_settings': { 'OTHER_CFLAGS': [ '-mavx' ] },
       'msvs_settings': {
         'VCCLCompilerTool': {
-          'EnableEnhancedInstructionSet': '4', # /arch:AVX
+          'EnableEnhancedInstructionSet': '3', # /arch:AVX
         },
       },
     },
     {
       'target_name': 'libvpx_intrinsics_avx2',
       'type': 'static_library',
       'include_dirs': [
         'source/config/<(OS_CATEGORY)/<(target_arch_full)',
         '<(libvpx_source)',
       ],
@@ skipping 10 matching lines @@
       'cflags': [ '-mavx2', ],
       'xcode_settings': { 'OTHER_CFLAGS': [ '-mavx2' ] },
       'msvs_settings': {
         'VCCLCompilerTool': {
           'EnableEnhancedInstructionSet': '5', # /arch:AVX2
         },
       },
     },
   ],
 }