added GetAllEncodingNames(), use it to select the correct encoding name to pass to iconv_open()

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35566 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/fontmap.h

@@ -90,10 +90,13 @@ public:
     // get the n-th supported encoding
     static wxFontEncoding GetEncoding(size_t n);
 
-    // return internal string identifier for the encoding (see also
-    // GetEncodingDescription())
+    // return canonical name of this encoding (this is a short string,
+    // GetEncodingDescription() returns a longer one)
     static wxString GetEncodingName(wxFontEncoding encoding);
 
+    // return a list of all names of this encoding (see GetEncodingName)
+    static const wxChar** GetAllEncodingNames(wxFontEncoding encoding);
+
     // return user-readable string describing the given encoding
     //
     // NB: hard-coded now, but might change later (read it from config?)