Fix compiler warning about unused function when building with the libjpeg v6b API/ABI
Fix compiler warning about unused function when building with the libjpeg v6b API/ABI



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