Appveyor: use Windows SDK 10.0.17763.0

Author: TheMostDiligent

appveyor.yml

@@ -15,12 +15,14 @@ environment:
     - platform: x64
       configuration: Debug
       cmake_args: -D DILIGENT_BUILD_CORE_TESTS=TRUE -D DILIGENT_BUILD_TOOLS_TESTS=TRUE
+      WindowsTargetPlatformVersion: 10.0.17763.0
       platform_name: Windows
 
     # Win32/x64/RelWithDebInfo
     - platform: x64
       configuration: RelWithDebInfo
       cmake_args:
+      WindowsTargetPlatformVersion: 10.0.17763.0
       platform_name: Windows
 
 # clone directory