清华大学:
/etc/pacman.d/mirrorlist.mingw32
Server = https://mirrors.tuna.tsinghua.edu.cn/msys2/mingw/i686
/etc/pacman.d/mirrorlist.mingw64
Server = https://mirrors.tuna.tsinghua.edu.cn/msys2/mingw/x86_64
/etc/pacman.d/mirrorlist.msys
Server = https://mirrors.tuna.tsinghua.edu.cn/msys2/msys/$arch