Merge r1744980 from trunk:

Save a few bytes in the conf pool.

The directive's names don't need to be duplicated in this pool when parsing the configuration file.

Either they match a known directive name and we can use it directly if needed. Otherwise, it is still possible to make a copy afterwards.
Submitted by: jailletc36
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1747055 13f79535-47bb-0310-9956-ffa450edef68