* Use distinct char pointers for sending and receiving buffers to avoid

  destroying the pointer to the sending buffer in the ajp message if
  data is received from the backend before all data is sent to the
  backend.

PR: 45911


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@709666 13f79535-47bb-0310-9956-ffa450edef68