Merge r1711553, r1713040, r1683881 from trunk:

Constify + save a few bytes in conf pool

Save a few bytes in conf pool when processing 'AllowOverrideList'.

The 'override_list' table is allocated from the cmd->pool, just as all strings from argv[].
So there is no need to duplicate them.

+ some minor style issues

Save a few bytes in conf pool
Submitted by: jailletc36
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1715015 13f79535-47bb-0310-9956-ffa450edef68