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Handle transferring large files from the built-in http server. Previously, the code attempted to malloc a block as large as the file itself. Now it uses the sendfile() system call so that the file isn't copied into userspace at all if it is available. Otherwise, it just uses a read/write of small chunks at a time. git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@72701 65c4cc65-6c06-0410-ace0-fbb531ad65f3