Correct implement wxLIST_AUTOSIZE_XXX in the generic wxListCtrl.

Use both the contents and the header width when wxLIST_AUTOSIZE_USEHEADER is
given instead of just the latter.

Also make both wxLIST_AUTOSIZE_USEHEADER and the previously implemented
wxLIST_AUTOSIZE work efficiently for the virtual list controls by reusing
wxMaxWidthCalculatorBase already used in the generic wxDataViewCtrl.

Closes #10326.

(this is a backport of de7e315557 and
0e2d9e539c from master)

include/wx/generic/private/widthcalc.h

@@ -11,7 +11,7 @@
 
 #include "wx/defs.h"
 
-#if wxUSE_DATAVIEWCTRL
+#if wxUSE_DATAVIEWCTRL || wxUSE_LISTCTRL
 
 #include "wx/timer.h"
 
@@ -117,6 +117,6 @@ private:
     wxDECLARE_NO_COPY_CLASS(wxMaxWidthCalculatorBase);
 };
 
-#endif // wxUSE_DATAVIEWCTRL
+#endif // wxUSE_DATAVIEWCTRL || wxUSE_LISTCTRL
 
 #endif // _WX_GENERIC_PRIVATE_WIDTHCALC_H_