[tlbuild] new mirror in China

[yaoge123]

http://mirrors.nju.edu.cn/tlpretest/
https://mirrors.nju.edu.cn/tlpretest/
rsync://mirrors.nju.edu.cn/tlpretest/

Bandwidth: 10Gb/s
Location: China
Sponsor: eScience Center, Nanjing University
Sponsor URL: https://sci.nju.edu.cn

Admin Name: Ge Yao
Admin Email contact: my at yaoge123.com
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