pip安装pillow失败需要补充环境依赖

首先pillow安装时需要gcc和g++环境，其次是一些系统环境包的依赖，这里官方给出了详细的依赖安装说明：https://pillow.readthedocs.io/en/latest/installation.html

以centos为例：

# 安装依赖
yum install python3-devel redhat-rpm-config
yum  install libtiff-devel libjpeg-devel openjpeg2-devel zlib-devel \
    freetype-devel lcms2-devel libwebp-devel tcl-devel tk-devel \
    harfbuzz-devel fribidi-devel libraqm-devel libimagequant-devel libxcb-devel
pip3 install Pillow