wxwidgets.cfg: Added support for more interfaces, found by daca@home

cfg/wxwidgets.cfg

@@ -7656,6 +7656,18 @@
     </arg>
     <arg nr="2" direction="in"/>
   </function>
+  <!-- bool wxCheckListBox::IsChecked( unsigned int uiIndex ) -->
+  <function name="wxCheckListBox::IsChecked">
+    <noreturn>false</noreturn>
+    <returnValue type="bool"/>
+    <use-retval/>
+    <const/>
+    <arg nr="1" direction="in">
+      <not-uninit/>
+      <valid>0:</valid>
+      <not-bool/>
+    </arg>
+  </function>
   <!-- void wxCheckListBox::Check (unsigned int item, bool check = true ) -->
   <function name="wxCheckListBox::Check">
     <noreturn>false</noreturn>