Suppress GetCompositeWindowParts() override warning for clang too

This uses the macro suppressing the warning for both gcc and clang
instead of doing it just for gcc as 58840fe7fd (Suppress unavoidable
-Wsuggest-override in wxCompositeWindow, 2022-12-25) did.

This is more correct and also simpler and shorter.

include/wx/compositewin.h

@@ -138,17 +138,14 @@ private:
     // warning, so disable this warning explicitly as we can't do anything else
     // about it here (as actually using "override" here would result in an
     // error for the first class in the hierarchy using wxCompositeWindow).
-#if wxCHECK_GCC_VERSION(5,1)
-    wxGCC_ONLY_WARNING_SUPPRESS(suggest-override)
-#endif
+    wxWARNING_SUPPRESS_MISSING_OVERRIDE()
 
     // Must be implemented by the derived class to return all children to which
     // the public methods we override should forward to.
     virtual wxWindowList GetCompositeWindowParts() const = 0;
 
-#if wxCHECK_GCC_VERSION(5,1)
-    wxGCC_ONLY_WARNING_RESTORE(suggest-override)
-#endif
+    wxWARNING_RESTORE_MISSING_OVERRIDE()
+
 
     template <class T, class TArg, class R>
     void SetForAllParts(R (wxWindowBase::*func)(TArg), T arg)