Bump libcompose and sync dependencies

vendor/github.com/godbus/dbus/conn_other.go

@@ -1,27 +0,0 @@
-// +build !darwin
-
-package dbus
-
-import (
-	"bytes"
-	"errors"
-	"os/exec"
-)
-
-func sessionBusPlatform() (*Conn, error) {
-	cmd := exec.Command("dbus-launch")
-	b, err := cmd.CombinedOutput()
-
-	if err != nil {
-		return nil, err
-	}
-
-	i := bytes.IndexByte(b, '=')
-	j := bytes.IndexByte(b, '\n')
-
-	if i == -1 || j == -1 {
-		return nil, errors.New("dbus: couldn't determine address of session bus")
-	}
-
-	return Dial(string(b[i+1 : j]))
-}