Fix a bug where a client which only sends \n to delimit header

lines (netcat) gets a strange looking HTTP_NOT_IMPLEMENTED message.

While I'm in there, start working on ebcdic co-existance with input
filtering.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86397 13f79535-47bb-0310-9956-ffa450edef68