Fix build when INPUT_SMOOTHING_SUPPORTED is undefined


git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1434 632fc199-4ca6-4c93-a231-07263d6284db
Remove unused code


git-svn-id: svn://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1436 632fc199-4ca6-4c93-a231-07263d6284db