net/httpproxy: remove loopback check in useProxy func Fixes golang/go#51416

[p53]

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[p53]

related to https://github.com/golang/go/issues/51416

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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This PR (HEAD: 2d3c203f0f87e6a14335075b8379eed82aac88aa) has been imported to Gerrit for code review.

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