Description: Fix FTBFS against Octave 6.1

 Use iscellstr method instead of deprecated is_cellstr.

Author: Rafael Laboissière <rafael@debian.org>

Bug-Debian: https://bugs.debian.org/976385

Forwarded: https://savannah.gnu.org/bugs/index.php?59376

Last-Update: 2020-12-07

--- octave-vibes-0.2.0.orig/src/__vibes__.cpp

+++ octave-vibes-0.2.0/src/__vibes__.cpp

@@ -127,7 +127,7 @@ void axisLabels (const octave_value_list

   __assertDrawing__ ();

   std::vector<std::string> labels;

   std::string figureName;

-  if (args(0).is_cellstr ())

+  if (args(0).iscellstr ())

     {

       // The first argument is a cellstr: use its contents as labels

       const Array<std::string> cellstr = args(0).cellstr_value ();