runtime: skip GDB tests on NetBSD

TestGdbAutotmpTypes times out for unknown reasons on NetBSd. Skip the
gdb tests on NetBSD for now.

Updates #22893

Change-Id: Ibb05b7260eabb74d805d374b25a43770939fa5f2
Reviewed-on: https://go-review.googlesource.com/80136
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/runtime/runtime-gdb_test.go

@@ -22,11 +22,15 @@ import (
 
 func checkGdbEnvironment(t *testing.T) {
 	testenv.MustHaveGoBuild(t)
-	if runtime.GOOS == "darwin" {
+	switch runtime.GOOS {
+	case "darwin":
 		t.Skip("gdb does not work on darwin")
-	}
-	if runtime.GOOS == "linux" && runtime.GOARCH == "ppc64" {
-		t.Skip("skipping gdb tests on linux/ppc64; see golang.org/issue/17366")
+	case "netbsd":
+		t.Skip("test times out on NetBSD for unknown reasons; issue 22893")
+	case "linux":
+		if runtime.GOARCH == "ppc64" {
+			t.Skip("skipping gdb tests on linux/ppc64; see golang.org/issue/17366")
+		}
 	}
 	if final := os.Getenv("GOROOT_FINAL"); final != "" && runtime.GOROOT() != final {
 		t.Skip("gdb test can fail with GOROOT_FINAL pending")