cgroup: add virCgroupAddMachineTask stub for win32

Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/util/vircgroup.c

@@ -4288,6 +4288,16 @@ virCgroupAddTask(virCgroupPtr group ATTRIBUTE_UNUSED,
 }
 
 
+int
+virCgroupAddMachineTask(virCgroupPtr group ATTRIBUTE_UNUSED,
+                        pid_t pid ATTRIBUTE_UNUSED)
+{
+    virReportSystemError(ENXIO, "%s",
+                         _("Control groups not supported on this platform"));
+    return -1;
+}
+
+
 int
 virCgroupAddTaskController(virCgroupPtr group ATTRIBUTE_UNUSED,
                            pid_t pid ATTRIBUTE_UNUSED,