This package doesn't work with Go 1.9 or above.
The bypass surgery for grafting the net and internal/poll packages of
Go 1.9 starts with disabling this packge.

Updates golang/go#19051.

Change-Id: I82d742d267f155cf440884e845b24402a5a5bfdf
Reviewed-on: https://go-review.googlesource.com/37034Reviewed-by: Ian Lance Taylor <iant@golang.org>