Move ldpc temporary files into platform-independent location.

git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6991 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

mainwindow.cpp

@@ -838,7 +838,6 @@ MainWindow::MainWindow(QDir const& temp_directory, bool multiple,
   }
 
   QString ldpcMsgFile = m_config.temp_dir().absoluteFilePath("ldpc_msg");
-  ldpcMsgFile = '"' + ldpcMsgFile + '"';
   ba = ldpcMsgFile.toLocal8Bit();
   for(int i=0; i<512; i++) {
     m_ldpcMsgFile[i]=32;