make golang support mod path more than utf8 rune with a flag

[yangyile1990]

when I use go 1.15 without go.mod, my go package can name as "ACM题目小马过河"。

while after I use go.mod in go1.20 or go1.21，it says. not support.

as you know, my go package is only for demo, so just give me a flag to make the go support chinese pkg name again is necessary. I do not push my code to github but just for fun.

thank you.

[seankhliao]

Duplicate of #45549

[yangyile1990]

ok. thank you.