wxwidgets.cfg: Added support for more interfaces

cfg/wxwidgets.cfg

@@ -13506,6 +13506,19 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- int wxPGMultiButton::GetButtonId(unsigned int i) const -->
+  <function name="wxPGMultiButton::GetButtonId">
+    <noreturn>false</noreturn>
+    <returnValue type="int"/>
+    <use-retval/>
+    <leak-ignore/>
+    <const/>
+    <arg nr="1" direction="in">
+      <not-uninit/>
+      <valid>0:</valid>
+      <not-bool/>
+    </arg>
+  </function>
   <!-- wxString wxCmdLineParser::GetParam(size_t n = 0) const -->
   <function name="wxCmdLineParser::GetParam">
     <noreturn>false</noreturn>