Windows style line end \r\n on README, license, and similar essential plaintext files.


scripts/make_win_src_distribution.sh:
  Some plain text files (which a Windows user might view in any editor) should have 
  Windows style line end \r\n (bug#5385). The tool is changed to do a systematic pass 
  over all files, find all relevant ones (especially "README*", "ChangeLog", "INSTALL*", 
  license text), and adapt them.
  Included are two minor cleanups ("useless use of cat" avoided, variable setting 
  moved to more sensible place).