* setup.c (filedel): New function.

* setup.c (filedel): New function.
(output_file): Keep track of files extracted from setup.exe for subsequent
deletion.
(tarx): Close process handle of child tar process or suffer handle leak.
(getdownloadsource): Close mirror file so that it can be unlinked.
(processdirlisting): Return total number of files extracted.
(main): Initialize array of files to delete.  Ensure that files are closed on
exit.  Make the directory that setup.exe is started from == the directory where
temporary files are placed.  Issue an error if no files were found to download.
* xsystem.c (xcreate_process): Close the thread handle.  Close the process
handle if we waited for it to exit.