Simplify the exit paths of ap_rgetline by creating a second brigade for

use when we do AP_MODE_SPECULATIVE.  This allows us to delete the
brigades earlier.

(In practice, it really doesn't matter if we delete the brigade or not
since it will be destroyed when it's pool is destroyed, but we'll try
to be nice.)


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93092 13f79535-47bb-0310-9956-ffa450edef68