libvpx: Pull from upstream

source/libvpx/build/make/gen_msvs_proj.sh

 #!/bin/bash
 ##
 ##  Copyright (c) 2010 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 55 matching lines @@
         for pat in ${pats//;/$IFS}; do
             if [ "${f##*.}" == "$pat" ]; then
                 unset file_list[i]
 
                 objf=$(echo ${f%.*}.obj \
                        | sed -e "s,$src_path_bare,," \
                              -e 's/^[\./]\+//g' -e 's,[:/ ],_,g')
                 open_tag File RelativePath="$f"
 
                 if [ "$pat" == "asm" ] && $asm_use_custom_step; then
+                    # Avoid object file name collisions, i.e. vpx_config.c and
+                    # vpx_config.asm produce the same object file without
+                    # this additional suffix.
+                    objf=${objf%.obj}_asm.obj
                     for plat in "${platforms[@]}"; do
                         for cfg in Debug Release; do
                             open_tag FileConfiguration \
                                 Name="${cfg}|${plat}" \
 
                             tag Tool \
                                 Name="VCCustomBuildTool" \
                                 Description="Assembling \$(InputFileName)" \
                                 CommandLine="$(eval echo \$asm_${cfg}_cmdline) -o \$(IntDir)\\$objf" \
                                 Outputs="\$(IntDir)\\$objf" \
@@ skipping 391 matching lines @@
     sed  -e '/"/s;\([^ "]\)/;\1\\;g' > ${outfile}
 
 exit
 <!--
 TODO: Add any files not captured by filters.
                 <File
                         RelativePath=".\ReadMe.txt"
                         >
                 </File>
 -->