Adding upstream version 3.10.8.

Signed-off-by: Daniel Baumann <daniel@debian.org>

util/exec_unix.go

@@ -0,0 +1,24 @@
+// Copyright Earl Warren <contact@earl-warren.org>
+// Copyright Loïc Dachary <loic@dachary.org>
+// SPDX-License-Identifier: MIT
+
+//    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+//go:build !windows
+
+package util
+
+import (
+	"os"
+	"os/exec"
+	"syscall"
+)
+
+func SetSysProcAttribute(cmd *exec.Cmd) {
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+}
+
+func kill(p *os.Process) error {
+	return syscall.Kill(-p.Pid, syscall.SIGKILL)
+}