Fix handling of case when a client has sent "Expect: 100-continue"

and we are going to respond with an error, but get stuck waiting to
discard the body in the pointless hope of preserving the connection.

This remains less than satisfactory, since what we really should be
doing is sending the response immediately and discarding the request
body as some form of post-response cleanup.  Something to consider.

PR: 4499, 3806
Submitted by:	Roy Fielding, Joe Orton <jeo101@york.ac.uk>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@83468 13f79535-47bb-0310-9956-ffa450edef68