For now, punt on trying to support fancy upsampling in tjDecodeYUV(). Fancy upsampli...

For now, punt on trying to support fancy upsampling in tjDecodeYUV().  Fancy upsampling requires context rows and other refinements, which are difficult to implement correctly with the algorithm we're using.  Longer-term, supporting fancy upsampling would probably require using the main buffer that libjpeg allocates.

git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1145 632fc199-4ca6-4c93-a231-07263d6284db