Description: Fix build after the client library changed the API.

Index: prometheus-bind-exporter/bind_exporter.go
===================================================================
--- prometheus-bind-exporter.orig/bind_exporter.go
+++ prometheus-bind-exporter/bind_exporter.go
@@ -457,8 +457,8 @@ func main() {
 
 	prometheus.MustRegister(NewExporter(*bindVersion, *bindURI, *bindTimeout, groups))
 	if *bindPidFile != "" {
-		procExporter := prometheus.NewProcessCollectorPIDFn(
-			func() (int, error) {
+		procOpts := prometheus.ProcessCollectorOpts{
+			PidFn: func() (int, error) {
 				content, err := ioutil.ReadFile(*bindPidFile)
 				if err != nil {
 					return 0, fmt.Errorf("Can't read pid file: %s", err)
@@ -468,7 +468,10 @@ func main() {
 					return 0, fmt.Errorf("Can't parse pid file: %s", err)
 				}
 				return value, nil
-			}, namespace)
+			},
+			Namespace: namespace,
+		}
+		procExporter := prometheus.NewProcessCollector(procOpts)
 		prometheus.MustRegister(procExporter)
 	}