suppress warning about implicit conversion of literal string XmSTRING_DEFAULT_CHARSET to non-const char *

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61187 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/motif/private.h

@@ -141,7 +141,11 @@ class wxXmString
 {
     void Init(const char *str)
     {
-        m_string = XmStringCreateLtoR((char *)str, XmSTRING_DEFAULT_CHARSET);
+        m_string = XmStringCreateLtoR
+                   (
+                    const_cast<char *>(str),
+                    const_cast<char *>(XmSTRING_DEFAULT_CHARSET)
+                   );
     }
 
 public: