Stopgap solution for CGI 3-second delay with server-side includes: if

processing a subrequest, allocate memory from r->main->pool instead
of r->pool so that we can avoid waiting for free_proc_chain to cleanup
in the middle of an SSI request.

Submitted by: Dean Gaudet, PR #122
Reviewed by: Roy Fielding


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@77784 13f79535-47bb-0310-9956-ffa450edef68