Mention unused variables removal in ChangeLog.md (#20176)

Adding a note for #20169
emscripten-core · Sep 1, 2023 · 0566a76 · 0566a76
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@@ -44,6 +44,7 @@ See docs/process.md for more on how version tagging works.
 - A new settings `TABLE_BASE` was introduced that can be used to place static
   function addresses (table slots) at a certain offset.  This defaults to 1
   which is the previously fixed value. (#20149)
+- Clang's error detection of unused variables `-Wunused-variable` improved, which may require changes in user code (see #20169).
 
 3.1.45 - 08/23/23
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