[dmd-cxx] fix Issue 21295: Add test for symbol lookup/resolve in compilation broken #11831
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Strictly, this is related to good old issue 10378
In dmd mainline, this went from compilable -> fail_compilation due to an indirect bug fix.
In dmd-cxx, we're still in the deprecation transition phase for bug 10378, so we use
-de
is used in the test instead.