Use 'apr_table_setn' instead of 'apr_table_set' when possible in order to save memory.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1578759 13f79535-47bb-0310-9956-ffa450edef68
Use 'apr_table_setn' instead of 'apr_table_set' when possible in order to save memory.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1578760 13f79535-47bb-0310-9956-ffa450edef68