libvpx: Pull from upstream

source/libvpx/build/make/gen_msvs_vcxproj.sh

Index: source/libvpx/build/make/gen_msvs_vcxproj.sh
===================================================================
--- source/libvpx/build/make/gen_msvs_vcxproj.sh	(revision 240950)
+++ source/libvpx/build/make/gen_msvs_vcxproj.sh	(working copy)
@@ -33,7 +33,7 @@
     --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) of visual studio to generate for
+    --ver=version               Version (10,11,12) 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
@@ -228,7 +228,7 @@
         --ver=*)
             vs_ver="$optval"
             case "$optval" in
-                10|11)
+                10|11|12)
                 ;;
                 *) die Unrecognized Visual Studio Version in $opt
                 ;;
@@ -269,7 +269,7 @@
 asm_use_custom_step=false
 uses_asm=${uses_asm:-false}
 case "${vs_ver:-11}" in
-    10|11)
+    10|11|12)
        asm_use_custom_step=$uses_asm
     ;;
 esac
@@ -383,6 +383,20 @@
                     tag_content PlatformToolset v110
                 fi
             fi
+            if [ "$vs_ver" = "12" ]; then
+                if [ "$plat" = "ARM" ]; then
+                    # Setting the wp80 toolchain automatically sets the
+                    # WINAPI_FAMILY define, which is required for building
+                    # code for arm with the windows headers. Alternatively,
+                    # one could add AppContainerApplication=true in the Globals
+                    # section and add PrecompiledHeader=NotUsing and
+                    # CompileAsWinRT=false in ClCompile and SubSystem=Console
+                    # in Link.
+                    tag_content PlatformToolset v120_wp80
+                else
+                    tag_content PlatformToolset v120
+                fi
+            fi
             tag_content CharacterSet Unicode
             if [ "$config" = "Release" ]; then
                 tag_content WholeProgramOptimization true