安装PHP的时候提示：No package libjpeg found出现原因：缺少libjpeg 的依赖包
解决方案：
1、Redhat|CentOS7版本：
下载安装rpm包：
- wget http://mirror.centos.org/centos/7/os/x86_64/Packages/libjpeg-turbo-1.2.90-8.el7.x86_64.rpm
- wget http://mirror.centos.org/centos/7/os/x86_64/Packages/libjpeg-turbo-devel-1.2.90-8.el7.x86_64.rpm
