net: set IsNotFound on windows and plan9 DNS queries
Change-Id: I2a12acb3e4f31dd561d49f47a3b1ae3ac47ab894
GitHub-Last-Rev:
4733964f691c567ccad0279fb553442322543024
GitHub-Pull-Request: golang/go#63542
Reviewed-on: https://go-review.googlesource.com/c/go/+/534937
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
Run-TryBot: Mateusz Poliwczak <mpoliwczak34@gmail.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>