Correct our list of escape characters to include percent and the

  Correct our list of escape characters to include percent and the
  carriage return on Win32/OS2, and modify the \r \n escaping to account
  for the fact that Win32/OS2 don't pass these characters through a true
  argv[] mechansim; replace them with a whitespace since they effectively
  are for most applications.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94070 13f79535-47bb-0310-9956-ffa450edef68