Fix the per-server config merge function in mod_cache to

properly inherit CacheMaxStreamingBuffer
PR:
Obtained from:  Matthieu Estrade <estrade-m@ifrance.com>
Reviewed by:	Brian Pane


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96972 13f79535-47bb-0310-9956-ffa450edef68