changed wxArrayString::m_pItems from wxChar* to const wxChar*, the strings are not modified by the class

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44563 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/arrstr.h

@@ -328,7 +328,7 @@ private:
   size_t  m_nSize,    // current size of the array
           m_nCount;   // current number of elements
 
-  wxChar  **m_pItems; // pointer to data
+  const wxChar  **m_pItems; // pointer to data
 
   bool    m_autoSort; // if true, keep the array always sorted
 };