This update fulfils the request of bug 7109, which claimed the language arg to...

This update fulfils the request of bug 7109, which claimed the language arg to ast_stream_and_wait() was redundant. Almost all calls just used chan->language, and seeing how chan is the first argument, this certainly seems redundant. A change of language could just as easily be done by simply changing the channel language before calling.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@47821 65c4cc65-6c06-0410-ace0-fbb531ad65f3