net: remove unused goLookupHost method
net: remove unused goLookupHost method

Change-Id: I62b9d0dcbec647fdd3279d78b9999dd933ff0bbd
GitHub-Last-Rev: f83db66c935dd7a14128d1e87c9323539e9d2d16
GitHub-Pull-Request: golang/go#56758
Reviewed-on: https://go-review.googlesource.com/c/go/+/451135
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@google.com>
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@google.com>
Reviewed-by: Joedian Reid <454f26308bdf67a957daa60c4ad294a9b7c3fcbc@golang.org>
Auto-Submit: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@google.com>

golang/go,golang/go,golang/go,golang/go,golang/go,golang/go,golang/go,golang/go