bpo-35377: fix incorrect urls produced by urlunsplit

[devkral]

see bugreport for discussion.

https://bugs.python.org/issue35377

[the-knights-who-say-ni]

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[devkral]

sry, but my contributions are under Public Domain. I don't care which license you want to use.
a. I don't see this option in this cla
b. I want a simpler method

[brettcannon]

Thanks for the PR, but closing as the CLA has not been signed within the last month. If you do decide to sign the CLA we can re-open this PR.