x/tools/go/packages: TestCgoOption fails on Windows because net.cgoLookupHost doesn't exist

[dmitshur]

From a recent run of the windows-amd64-longtest builder (after increasing its memory in CL 208500):

--- FAIL: TestCgoOption (0.66s)
    stdlib_test.go:117: no object net.cgoLookupHost
FAIL
FAIL	golang.org/x/tools/go/packages	114.749s

The test tries to look for function cgoLookupHost, which exists in net/cgo_unix.go, but not in net/cgo_windows.go. I don't think the test can pass as is on Windows.

/cc @matloob per owners.

[dmitshur]

I understand this issue is a release blocker for Go 1.14 via #11811 and #35186.

[gopherbot]

Change https://golang.org/cl/212478 mentions this issue: go/packages: fix TestCgoOption to work on Windows