[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/string/wcsncpy_s.cpp

@@ -0,0 +1,20 @@
+//
+// wcsncpy_s.cpp
+//
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+//
+// Defines wcsncpy_s(), which appends n characters of the source string onto the
+// end of the destination string.
+//
+#include <corecrt_internal_string_templates.h>
+#include <string.h>
+
+extern "C" errno_t __cdecl wcsncpy_s(
+    wchar_t*       const destination,
+    size_t         const size_in_elements,
+    wchar_t const* const source,
+    size_t         const count
+    )
+{
+    return common_tcsncpy_s(destination, size_in_elements, source, count);
+}