Add ProtocolReqCheck directive, which determines if Apache will

check for a valid protocol string in the request (eg: HTTP/1.1)
and return HTTP_BAD_REQUEST if not valid. Versions of Apache
prior to 1.3.26 would silently ignore bad protocol strings, but
1.3.26 included a more strict check. This makes it runtime
configurable. The default is On. This also removes the requirement
on an ANSI sscanf() implementation.

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@95978 13f79535-47bb-0310-9956-ffa450edef68