remove WXWIN_COMPATIBILITY_2_6, add WXWIN_COMPATIBILITY_3_0

closes #15792

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75532 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/fs_arc.cpp

@@ -21,12 +21,7 @@
     #include "wx/log.h"
 #endif
 
-#if WXWIN_COMPATIBILITY_2_6 && wxUSE_ZIPSTREAM
-    #include "wx/zipstrm.h"
-#else
-    #include "wx/archive.h"
-#endif
-
+#include "wx/archive.h"
 #include "wx/private/fileback.h"
 
 //---------------------------------------------------------------------------
@@ -403,11 +398,6 @@ wxFSFile* wxArchiveFSHandler::OpenFile(
         return NULL;
     }
 
-#if WXWIN_COMPATIBILITY_2_6 && wxUSE_ZIPSTREAM
-    if (wxDynamicCast(factory, wxZipClassFactory))
-        ((wxZipInputStream*)s)->m_allowSeeking = true;
-#endif // WXWIN_COMPATIBILITY_2_6
-
     return new wxFSFile(s,
                         key + right,
                         wxEmptyString,