Add Windows Implementation Libraries

Externals/WIL/tests/CppWinRT20Tests.cpp

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+
+// Prior to C++/WinRT 2.0 this would cause issues since we're not including wil/cppwinrt.h in this translation unit.
+// However, since we're going to link into the same executable as 'CppWinRTTests.cpp', the 'winrt_to_hresult_handler'
+// global function pointer should be set, so these should all run successfully
+
+#include <winrt/base.h>
+#include <wil/result.h>
+
+#include "common.h"
+
+TEST_CASE("CppWinRTTests::CppWinRT20Test", "[cppwinrt]")
+{
+    auto test = [](HRESULT hr)
+    {
+        try
+        {
+            THROW_HR(hr);
+        }
+        catch (...)
+        {
+            REQUIRE(hr == winrt::to_hresult());
+        }
+    };
+
+    test(E_OUTOFMEMORY);
+    test(E_INVALIDARG);
+    test(E_UNEXPECTED);
+}