win32u: Add partial wow64 support.

dlls/win32u/syscall.c

@@ -160,3 +160,21 @@ unixlib_entry_t __wine_unix_call_funcs[] =
     init,
     callbacks_init,
 };
+
+#ifdef _WIN64
+
+WINE_DEFAULT_DEBUG_CHANNEL(win32u);
+
+static NTSTATUS wow64_init( void *args )
+{
+    FIXME( "\n" );
+    return STATUS_NOT_SUPPORTED;
+}
+
+const unixlib_entry_t __wine_unix_call_wow64_funcs[] =
+{
+    init,
+    wow64_init,
+};
+
+#endif /* _WIN64 */