[clang] [clang] Add check for duplicates to make_cxx_dr_status script (PR #67969)

[Vlad Serebrennikov via cfe-commits]

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@@ -7145,7 +7145,7 @@ <h2 id="cxxdr">C++ defect report implementation status</h2>
     <td><a href="https://cplusplus.github.io/CWG/issues/1223.html">1223</a></td>
     <td>drafting</td>
     <td>Syntactic disambiguation and <I>trailing-return-type</I>s</td>
-    <td align="center">Not resolved</td>
+    <td class="unreleased" align="center">Clang 17</td>
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Endilll wrote:

`make_cxx_dr_status` is not yet updated to know that 17 has been released. I'll address it in a separate PR.

https://github.com/llvm/llvm-project/pull/67969