zbar的GB18030乱码问题
由于zbar不支持GB18030，所以要重新编译zbar的源码。我用mac编译总是报错，
configure: error: in `/Users/imac/Documents/ios/zbar/zbar-0-1.10':
configure: error: test for video support failed!
rebuild your kernel to include video4linux support or
configure --disable-video to skip building video support.
See `config.log' for more details.
