(Recall: whenever a table's nelts == nalloc and a push is attempted

the table size will be doubled, and the old table copied to the new
table.  It's nice to avoid this if it's easy.)

Our default server outputs 8 headers, with the expires module it will
do 10 headers.  Increase the default r->headers_out table to size 12
to accomodate that (plus a cookie and one other thing).

rename_original_environment should use nalloc instead of nelts when
selecting a table size.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@80058 13f79535-47bb-0310-9956-ffa450edef68