Fix FTBFS with Python 3.13.

This solves issue #46.

Signed-off-by: François Andriot <albator78@libertysurf.fr>
(cherry picked from commit 0e74dd2dcc)

kig/scripting/python_scripter.cpp

@@ -495,9 +495,9 @@ ObjectImp* PythonScripter::calc( CompiledPythonScript& script, const Args& args
     };
     tuple argstup( argstuph );
 
-    handle<> reth( PyEval_CallObject( calcfunc.ptr(), argstup.ptr() ) );
+    handle<> reth( PyObject_CallObject( calcfunc.ptr(), argstup.ptr() ) );
 //    object resulto = calcfunc( argstup );
-//    handle<> reth( PyEval_CallObject( calcfunc.ptr(), args ) );
+//    handle<> reth( PyObject_CallObject( calcfunc.ptr(), args ) );
     object resulto( reth );
 
     extract<ObjectImp&> result( resulto );