linux下，rgb24数据进行jpeg压缩，使用libjpeg 9.0，libjpeg先编译为libjpeg.a文件，再调用，有示例，示例在内存中实现。-Under linux, rgb24 data jpeg compression, use libjpeg 9.0, libjpeg first compiled to libjpeg.a file, then call, a sample, sample implementation in memory.