CMake: updated detection of the Windows SDK version

CMakeLists.txt

@@ -101,10 +101,10 @@ message("CMake generator: " ${CMAKE_GENERATOR})
 if(WIN32)
     if(${CMAKE_SYSTEM_NAME} STREQUAL "WindowsStore")
         set(PLATFORM_UNIVERSAL_WINDOWS TRUE CACHE INTERNAL "Target platform: Windows Store")
-        message("Target platform: Universal Windows " ${ARCH} ". SDK Version: " ${CMAKE_SYSTEM_VERSION})
+        message("Target platform: Universal Windows " ${ARCH} ". SDK Version: " ${CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION})
     else()
         set(PLATFORM_WIN32 TRUE CACHE INTERNAL "Target platform: Win32") #WIN32 is a variable, so we cannot use string "WIN32"
-        message("Target platform: Win32 " ${ARCH} ". SDK Version: " ${CMAKE_SYSTEM_VERSION})
+        message("Target platform: Win32 " ${ARCH} ". SDK Version: " ${CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION})
     endif()
 else()
     if(${CMAKE_SYSTEM_NAME} STREQUAL "Android")
@@ -144,7 +144,7 @@ add_library(Diligent-PublicBuildSettings INTERFACE)
 if(PLATFORM_WIN32)
     if(MSVC)
         set(D3D11_SUPPORTED TRUE CACHE INTERNAL "D3D11 is supported on Win32 platform")
-        if(CMAKE_SYSTEM_VERSION VERSION_GREATER_EQUAL "10.0")
+        if(CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION VERSION_GREATER_EQUAL "10.0")
             set(D3D12_SUPPORTED TRUE CACHE INTERNAL "D3D12 is supported on Win32 platform")
         endif()
     else()
@@ -160,7 +160,7 @@ if(PLATFORM_WIN32)
     target_compile_definitions(Diligent-PublicBuildSettings INTERFACE PLATFORM_WIN32=1)
 elseif(PLATFORM_UNIVERSAL_WINDOWS)
     set(D3D11_SUPPORTED TRUE CACHE INTERNAL "D3D11 is supported on Universal Windows platform")
-    if(CMAKE_SYSTEM_VERSION VERSION_GREATER_EQUAL "10.0")
+    if(CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION VERSION_GREATER_EQUAL "10.0")
         set(D3D12_SUPPORTED TRUE CACHE INTERNAL "D3D12 is supported on Universal Windows platform")
     endif()
     set(ARCHIVER_SUPPORTED TRUE CACHE INTERNAL "Archiver is supported on Universal Windows platform")