Merge r732832, r733134, r733218 from trunk:

Translate locally generated "100-Continue" message to
ASCII on EBCDIC systems.


EBCDIC fix for ap_send_interim_response()



simplifications per niq's review comments

Submitted by: covener
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@733759 13f79535-47bb-0310-9956-ffa450edef68