net/internal/cgotest: don't try to use cgo with netgo build tag

When using bazel with hermetic_cc_toolchain resolv.h is not available.

Change-Id: I2aed72e6c14535cb1400b30d285bf05aa2498fde
GitHub-Last-Rev: 818c723
GitHub-Pull-Request: #70141
Reviewed-on: https://go-review.googlesource.com/c/go/+/623816
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
Reviewed-by: Mateusz Poliwczak <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
Reviewed-by: David Chase <[email protected]>

Author: Links2004

src/net/internal/cgotest/resstate.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build cgo && darwin
+//go:build !netgo && cgo && darwin
 
 package cgotest