Add a stub for virCgroupGetDomainTotalCpuStats

Commit 6515889 broke the build on FreeBSD:
In function `qemuDomainGetCPUStats':
/../../src/qemu/qemu_driver.c:16102:
undefined reference to `virCgroupGetDomainTotalCpuStats'

src/util/vircgroup.c

@@ -4260,6 +4260,17 @@ virCgroupGetCpuacctStat(virCgroupPtr group ATTRIBUTE_UNUSED,
 }
 
 
+int
+virCgroupGetDomainTotalCpuStats(virCgroupPtr group ATTRIBUTE_UNUSED,
+                                virTypedParameterPtr params ATTRIBUTE_UNUSED,
+                                int nparams ATTRIBUTE_UNUSED)
+{
+    virReportSystemError(ENOSYS, "%s",
+                         _("Control groups not supported on this platform"));
+    return -1;
+}
+
+
 int
 virCgroupSetFreezerState(virCgroupPtr group ATTRIBUTE_UNUSED,
                          const char *state ATTRIBUTE_UNUSED)