libvpx: Pull from upstream

source/libvpx/build/make/gen_msvs_vcxproj.sh

Index: source/libvpx/build/make/gen_msvs_vcxproj.sh
diff --git a/source/libvpx/build/make/gen_msvs_vcxproj.sh b/source/libvpx/build/make/gen_msvs_vcxproj.sh
index b653651030e41f6f48b5c30958aa37f3291b2401..182ea28fa775aac7bf3b08caa66ba75da156feda 100755
--- a/source/libvpx/build/make/gen_msvs_vcxproj.sh
+++ b/source/libvpx/build/make/gen_msvs_vcxproj.sh
@@ -34,7 +34,7 @@ Options:
     --name=project_name         Name of the project (required)
     --proj-guid=GUID            GUID to use for the project
     --module-def=filename       File containing export definitions (for DLLs)
-    --ver=version               Version (10,11,12) of visual studio to generate for
+    --ver=version               Version (10,11,12,14) of visual studio to generate for
     --src-path-bare=dir         Path to root of source tree
     -Ipath/to/include           Additional include directories
     -DFLAG[=value]              Preprocessor macros to define
@@ -168,7 +168,7 @@ for opt in "$@"; do
         --ver=*)
             vs_ver="$optval"
             case "$optval" in
-                10|11|12)
+                10|11|12|14)
                 ;;
                 *) die Unrecognized Visual Studio Version in $opt
                 ;;
@@ -218,7 +218,7 @@ guid=${guid:-`generate_uuid`}
 asm_use_custom_step=false
 uses_asm=${uses_asm:-false}
 case "${vs_ver:-11}" in
-    10|11|12)
+    10|11|12|14)
        asm_use_custom_step=$uses_asm
     ;;
 esac
@@ -344,6 +344,9 @@ generate_vcxproj() {
                 # has to enable AppContainerApplication as well.
                 tag_content PlatformToolset v120
             fi
+            if [ "$vs_ver" = "14" ]; then
+                tag_content PlatformToolset v140
+            fi
             tag_content CharacterSet Unicode
             if [ "$config" = "Release" ]; then
                 tag_content WholeProgramOptimization true