Eliminated various large (8KB) string buffers from the stack in

mod_include by adding support for a power-of-two pool-based allocator
in ap_ssi_parse_string(). (The default operation of this function
is backward-compatible, to support the other modules that call it.)
This change should help reduce memory usage for servers delivering
shtml pages.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@92747 13f79535-47bb-0310-9956-ffa450edef68