pkg/runtest, pkg/csource: don't run tests on openbsd

The tests are currently broken on openbsd.

pkg/csource/csource_test.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"math/rand"
 	"os"
+	"runtime"
 	"strings"
 	"testing"
 	"time"
@@ -16,6 +17,10 @@ import (
 )
 
 func TestGenerate(t *testing.T) {
+	switch runtime.GOOS {
+	case "openbsd":
+		t.Skipf("broken on %v", runtime.GOOS)
+	}
 	t.Parallel()
 	for _, target := range prog.AllTargets() {
 		switch target.OS {

pkg/runtest/run_test.go

@@ -17,6 +17,10 @@ import (
 )
 
 func Test(t *testing.T) {
+	switch runtime.GOOS {
+	case "openbsd":
+		t.Skipf("broken on %v", runtime.GOOS)
+	}
 	for _, sysTarget := range targets.List["test"] {
 		sysTarget1 := targets.Get(sysTarget.OS, sysTarget.Arch)
 		t.Run(sysTarget1.Arch, func(t *testing.T) {