Windows 10 ARM64 - Python 3.6

python36-win-arm64.patch

These are the deltas required for the python.props file to build for ARM64 on Windows. You still need to add
the ARM64 platform definitions to the solution/project files before you can build, though.

diff --git a/PCbuild/python.props b/PCbuild/python.props
index 16a7672315..d865c86211 100644
--- a/PCbuild/python.props
+++ b/PCbuild/python.props
@@ -74,7 +74,8 @@
     -->
     <_RegistryVersion>$(Registry:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SDKs\Windows\v10.0@ProductVersion)</_RegistryVersion>
     <_RegistryVersion Condition="$(_RegistryVersion) == ''">$(Registry:HKEY_LOCAL_MACHINE\WOW6432Node\SOFTWARE\Microsoft\Microsoft SDKs\Windows\v10.0@ProductVersion)</_RegistryVersion>
-    <DefaultWindowsSDKVersion>10.0.15063.0</DefaultWindowsSDKVersion>
+    <DefaultWindowsSDKVersion>10.0.16299.0</DefaultWindowsSDKVersion>
+    <DefaultWindowsSDKVersion Condition="$(_RegistryVersion) == '10.0.15063'">10.0.15063.0</DefaultWindowsSDKVersion>
     <DefaultWindowsSDKVersion Condition="$(_RegistryVersion) == '10.0.14393'">10.0.14393.0</DefaultWindowsSDKVersion>
     <DefaultWindowsSDKVersion Condition="$(_RegistryVersion) == '10.0.10586'">10.0.10586.0</DefaultWindowsSDKVersion>
     <DefaultWindowsSDKVersion Condition="$(_RegistryVersion) == '10.0.10240'">10.0.10240.0</DefaultWindowsSDKVersion>
@@ -176,6 +177,16 @@
     <!-- The version number for sys.winver -->
     <SysWinVer>$(MajorVersionNumber).$(MinorVersionNumber)$(PyArchExt)$(PyTestExt)</SysWinVer>
   </PropertyGroup>
+
+  <PropertyGroup Label="UserMacros">
+    <WindowsSDKDesktopARM64Support>true</WindowsSDKDesktopARM64Support>
+  </PropertyGroup>
+  <ItemGroup>
+    <BuildMacro Include="WindowsSDKDesktopARM64Support">
+      <Value>$(WindowsSDKDesktopARM64Support)</Value>
+      <EnvironmentVariable>true</EnvironmentVariable>
+    </BuildMacro>
+  </ItemGroup>

   <!-- Displays the calculated version info -->
   <Target Name="ShowVersionInfo">