libvpx: Pull from upstream

source/libvpx/build/make/gen_msvs_vcxproj.sh

 #!/bin/bash
 ##
 ##  Copyright (c) 2013 The WebM 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.
 ##
@@ skipping 156 matching lines @@
                             tag_content Outputs "\$(IntDir)$objf" \
                                 Condition="'\$(Configuration)|\$(Platform)'=='$cfg|$plat'"
                         done
                     done
                     close_tag CustomBuild
                 elif [ "$pat" == "c" ] || [ "$pat" == "cc" ] ; then
                     open_tag ClCompile \
                         Include=".\\$f"
                     # Separate file names with Condition?
                     tag_content ObjectFileName "\$(IntDir)$objf"
+                    # Check for AVX and turn it on to avoid warnings.
+                    if [[ $f =~ avx.?\.c$ ]]; then
+                        tag_content AdditionalOptions "/arch:AVX"
+                    fi
                     close_tag ClCompile
                 elif [ "$pat" == "h" ] ; then
                     tag ClInclude \
                         Include=".\\$f"
                 elif [ "$pat" == "vcxproj" ] ; then
                     open_tag ProjectReference \
                         Include="$f"
                     depguid=`grep ProjectGuid "$f" | sed 's,.*<.*>\(.*\)</.*>.*,\1,'`
                     tag_content Project "$depguid"
                     tag_content ReferenceOutputAssembly false
@@ skipping 348 matching lines @@
 }
 
 # This regexp doesn't catch most of the strings in the vcxproj format,
 # since they're like <tag>path</tag> instead of <tag attr="path" />
 # as previously. It still seems to work ok despite this.
 generate_vcxproj |
     sed  -e '/"/s;\([^ "]\)/;\1\\;g' |
     sed  -e '/xmlns/s;\\;/;g' > ${outfile}
 
 exit