Make gnupload portable to EBCDIC hosts. * lib/gnupload: Use literal newline as argument for 'tr' rather than \015, for EBCDIC hosts. Also, avoid unportable nested double-quotes and backquotes. * THANKS: Update. Report from Eric Blake and Steve Goetze via gnulib. Signed-off-by: Ralf Wildenhues <Ralf.Wildenhues@gmx.de>