Copying this code requires a (global) pool and rv declaration.

We don't need to replace this upon restart, so the global pool 
is ideal, and ap_my_generation is a good test for this.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@609366 13f79535-47bb-0310-9956-ffa450edef68