move 8 copies of the same function to common code

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54092 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/menucmn.cpp

@@ -125,6 +125,13 @@ void wxMenuItemBase::SetHelp(const wxString& str)
     }
 }
 
+#ifndef __WXPM__
+wxString wxMenuItemBase::GetLabelText(const wxString& text)
+{
+    return wxStripMenuCodes(text);
+}
+#endif
+
 #if WXWIN_COMPATIBILITY_2_8
 wxString wxMenuItemBase::GetLabelFromText(const wxString& text)
 {