[Bug c++/61339] add mismatch between struct and class [-Wmismatched-tags] to non-bugs

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61339

--- Comment #15 from Martin Sebor <msebor at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #14)

The patch that implements -Wmismatched-tags is still in review.  Here's the
latest: https://gcc.gnu.org/ml/gcc-patches/2019-12/msg01154.html