Use wxDynamicCast() instead of IsKindOf() checks.

wxDynamicCast() is less verbose (due to the absence of "CLASSINFO") and more
compatible with the standard dynamic_cast<>, so prefer to use it when possible.

See #14356.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71624 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/fs_arc.cpp

@@ -405,7 +405,7 @@ wxFSFile* wxArchiveFSHandler::OpenFile(
     }
 
 #if WXWIN_COMPATIBILITY_2_6 && wxUSE_ZIPSTREAM
-    if (factory->IsKindOf(CLASSINFO(wxZipClassFactory)))
+    if (wxDynamicCast(factory, wxZipClassFactory))
         ((wxZipInputStream*)s)->m_allowSeeking = true;
 #endif // WXWIN_COMPATIBILITY_2_6