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 263011)
+++ source/libvpx/build/make/gen_msvs_vcxproj.sh	(working copy)
@@ -28,6 +28,7 @@
     --lib                       Generate a project for creating a static library
     --dll                       Generate a project for creating a dll
     --static-crt                Use the static C runtime (/MT)
+    --enable-werror             Treat warnings as errors (/WX)
     --target=isa-os-cc          Target specifier (required)
     --out=filename              Write output to a file [stdout]
     --name=project_name         Name of the project (required)
@@ -173,7 +174,8 @@
                         done
                     done
                     close_tag CustomBuild
-                elif [ "$pat" == "c" ] || [ "$pat" == "cc" ] ; then
+                elif [ "$pat" == "c" ] || \
+                     [ "$pat" == "cc" ] || [ "$pat" == "cpp" ]; then
                     open_tag ClCompile \
                         Include=".\\$f"
                     # Separate file names with Condition?
@@ -233,6 +235,8 @@
         ;;
         --static-crt) use_static_runtime=true
         ;;
+        --enable-werror) werror=true
+        ;;
         --ver=*)
             vs_ver="$optval"
             case "$optval" in
@@ -492,7 +496,9 @@
             tag_content PreprocessorDefinitions "WIN32;$debug;_CRT_SECURE_NO_WARNINGS;_CRT_SECURE_NO_DEPRECATE$extradefines;%(PreprocessorDefinitions)"
             tag_content RuntimeLibrary $runtime
             tag_content WarningLevel Level3
-            # DebugInformationFormat
+            if ${werror:-false}; then
+                tag_content TreatWarningAsError true
+            fi
             close_tag ClCompile
             case "$proj_kind" in
             exe)
@@ -519,7 +525,7 @@
     done
 
     open_tag ItemGroup
-    generate_filter "Source Files"   "c;cc;def;odl;idl;hpj;bat;asm;asmx;s"
+    generate_filter "Source Files"   "c;cc;cpp;def;odl;idl;hpj;bat;asm;asmx;s"
     close_tag ItemGroup
     open_tag ItemGroup
     generate_filter "Header Files"   "h;hm;inl;inc;xsd"