Add cdp support for xpath scrapers (#625)

Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

vendor/github.com/knq/sysutil/sysutil_bsd.go

@@ -0,0 +1,31 @@
+// +build darwin freebsd openbsd netbsd
+
+package sysutil
+
+import (
+	"bytes"
+	"encoding/binary"
+	"syscall"
+	"time"
+)
+
+func init() {
+	var err error
+
+	// get boot time
+	res, err := syscall.Sysctl("kern.boottime")
+	if err != nil {
+		btime = time.Now()
+		return
+	}
+
+	// decode
+	var t timeval
+	err = binary.Read(bytes.NewBuffer([]byte(res)), binary.LittleEndian, &t)
+	if err != nil {
+		btime = time.Now()
+		return
+	}
+
+	btime = time.Unix(int64(t.Sec), int64(t.Usec))
+}