ast_write() ignores ast_audiohook_write() results

In ast_write(), if a channel has a list of audiohooks, those
lists are written to and the resulting frame is what ast_write()
should continue with.  The problem was the returned audiohook frame
was not being handled at all, and the original frame passed
into it did not contain the mixed audio, so essentially audio
was being lost.  One result of this was chan_spy's whisper
mode no longer worked.  To complicate the issue, frames
passed into ast_write may either be a single frame, or a list
of frames.  So, as the list of frames is processed in the
audiohook_write, the returned frames had to be added to a new
list.

(closes issue #15660)
Reported by: corruptor
Tested by: dvossel



git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.4@214194 f38db490-d61c-443f-a65b-d21fe96a405b

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