Introduce ap_xlate_proto_{to|from}_ascii() to clean up some of

the EBCDIC support.  They are noops on ASCII machines, so this
type of translation doesn't have to be surrounded by #ifdef
CHARSET_EBCDIC.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@86751 13f79535-47bb-0310-9956-ffa450edef68