switch over to use free_multiple_buffers in the disk cache
switch over to use free_multiple_buffers in the disk cache

git-svn-id: 51f496e7cf1b55ee487494d18ee2d308bae7fe77@4745 f43f7eb3-cfe1-5f9d-1b5f-e45aa6702bda

steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent,steeve/libtorrent