Don't allocation large buffers on the stack to avoid over-running a fixed...

Don't allocation large buffers on the stack to avoid over-running a fixed length stack when ap_build_cont_config() is called recursively (ie. nested <IfDefine> blocks).

Reviewed by: bnicholes, nd, trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@103373 13f79535-47bb-0310-9956-ffa450edef68