move to a different file (channel.c for the time being) the

wrappers around the basic 'say' functions, and redeclare these
wrappers as ordinary functions rather than function pointers.

This way, alternative implementations of the 'say' functions
will only have to implement the basic functions and not the
wrappers.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@21338 65c4cc65-6c06-0410-ace0-fbb531ad65f3