make testclean should clean up .yuv and 4:4:0 files as well 
make testclean should clean up .yuv and 4:4:0 files as well 



m-2k/mozjpeg,billychappell/mozjpeg,billychappell/mozjpeg,bygreencn/mozjpeg,zhoujianhanyu/mozjpeg,bygreencn/mozjpeg,billychappell/mozjpeg,ekandrot/mozjpeg,bygreencn/mozjpeg,zhoujianhanyu/mozjpeg,bygreencn/mozjpeg,billychappell/mozjpeg,zhoujianhanyu/mozjpeg,m-2k/mozjpeg,billychappell/mozjpeg,ekandrot/mozjpeg,zhoujianhanyu/mozjpeg,zhoujianhanyu/mozjpeg,ekandrot/mozjpeg,ekandrot/mozjpeg,m-2k/mozjpeg,m-2k/mozjpeg,ekandrot/mozjpeg,bygreencn/mozjpeg,m-2k/mozjpeg