msys2添加源

修改msys64\etc\pacman.d 目录下有三个文件的内容：mirrorlist.mingw32 、mirrorlist.mingw64 、mirrorlist.msys。

下面为具体内容：

1、mirrorlist.mingw32：

##
## 32-bit Mingw-w64 repository mirrorlist
##

## Primary
## msys2.org
Server = http://mirrors.ustc.edu.cn/msys2/mingw/i686/
Server = http://repo.msys2.org/mingw/i686
Server = http://downloads.sourceforge.net/project/msys2/REPOS/MINGW/i686
Server = http://www2.futureware.at/~nickoe/msys2-mirror/i686/

2、 mirrorlist.mingw64：

##
## 64-bit Mingw-w64 repository mirrorlist
##

## Primary
## msys2.org
Server = http://mirrors.ustc.edu.cn/msys2/mingw/x86_64/
Server = http://repo.msys2.org/mingw/x86_64
Server = http://downloads.sourceforge.net/project/msys2/REPOS/MINGW/x86_64
Server = http://www2.futureware.at/~nickoe/msys2-mirror/x86_64/
Server = http://mirror.bit.edu.cn/msys2/REPOS/

3、 mirrorlist.msys

##
## MSYS2 repository mirrorlist
##

## Primary
## msys2.org
Server = http://mirrors.ustc.edu.cn/msys2/msys/$arch/
Server = http://repo.msys2.org/msys/$arch
Server = http://downloads.sourceforge.net/project/msys2/REPOS/MSYS2/$arch
Server = http://www2.futureware.at/~nickoe/msys2-mirror/msys/$arch/

注意：该源为中科大源。