Fix building wxIniConfig when wxUSE_BASE64=0

Use guards for wxUSE_BASE64 just as wxConfigBase does.

include/wx/msw/iniconf.h

@@ -81,11 +81,15 @@ protected:
   // read/write
   bool DoReadString(const wxString& key, wxString *pStr) const wxOVERRIDE;
   bool DoReadLong(const wxString& key, long *plResult) const wxOVERRIDE;
+#if wxUSE_BASE64
   bool DoReadBinary(const wxString& key, wxMemoryBuffer *buf) const wxOVERRIDE;
+#endif // wxUSE_BASE64
 
   bool DoWriteString(const wxString& key, const wxString& szValue) wxOVERRIDE;
   bool DoWriteLong(const wxString& key, long lValue) wxOVERRIDE;
+#if wxUSE_BASE64
   bool DoWriteBinary(const wxString& key, const wxMemoryBuffer& buf) wxOVERRIDE;
+#endif // wxUSE_BASE64
 
 private:
   // helpers

src/msw/iniconf.cpp

@@ -358,6 +358,8 @@ bool wxIniConfig::DoWriteLong(const wxString& szKey, long lValue)
   return Write(szKey, wxString::Format(wxT("%ld"), lValue));
 }
 
+#if wxUSE_BASE64
+
 bool wxIniConfig::DoReadBinary(const wxString& WXUNUSED(key),
                                wxMemoryBuffer * WXUNUSED(buf)) const
 {
@@ -374,6 +376,8 @@ bool wxIniConfig::DoWriteBinary(const wxString& WXUNUSED(key),
     return false;
 }
 
+#endif // wxUSE_BASE64
+
 bool wxIniConfig::Flush(bool /* bCurrentOnly */)
 {
   // this is just the way it works