cmd/dist: add misc/cgo/test with -linkmode=auto

Change-Id: I5939524f75f8fbbd67bd54b7c9e4b8c162337e9d
Reviewed-on: https://go-review.googlesource.com/8525
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
Reviewed-by: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/cmd/dist/test.go

@@ -376,6 +376,12 @@ func (t *tester) cgoTest() error {
 		return cmd.Run()
 	}
 
+	cmd := t.dirCmd("misc/cgo/test", "go", "test", "-ldflags", "-linkmode=auto")
+	cmd.Env = env
+	if err := cmd.Run(); err != nil {
+		return err
+	}
+
 	if t.gohostos != "dragonfly" {
 		// linkmode=internal fails on dragonfly since errno is a TLS relocation.
 		cmd := t.dirCmd("misc/cgo/test", "go", "test", "-ldflags", "-linkmode=internal")