Submit patch based on Michael W.'s invalid UTF8

to PUA patch. I added UTF8_TO_OCTAL and made
    that the default for filename conversion uner
    GTK2. More adapation, e.g. to G_FILENAME_ENCODING
    need to be done.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@33099 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/strconv.h

@@ -104,8 +104,18 @@ public:
 class WXDLLIMPEXP_BASE wxMBConvUTF8 : public wxMBConv
 {
 public:
+    enum { 
+        MAP_INVALID_UTF8_NOT = 0,
+        MAP_INVALID_UTF8_TO_PUA = 1,
+        MAP_INVALID_UTF8_TO_OCTAL = 2
+    };
+
+    wxMBConvUTF8(int options = MAP_INVALID_UTF8_NOT) : m_options(options) { }
     virtual size_t MB2WC(wchar_t *outputBuf, const char *psz, size_t outputSize) const;
     virtual size_t WC2MB(char *outputBuf, const wchar_t *psz, size_t outputSize) const;
+    
+private:
+    int m_options;
 };
 
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