Add the ProxyIOBufferSize option. Previously the size of the

buffer used while reading from the remote server in proxy was
taken from ProxyReceiveBufferSize. These two functions were
similar but not the same, thus the need for the split.
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@93821 13f79535-47bb-0310-9956-ffa450edef68