vircgroup: Finish renaming of virCgroupIsolateMount

In dc576025 we renamed virCgroupIsolateMount function to
virCgroupBindMount. However, we forgot about one occurrence in
section of the code which provides stubs for platforms without
support for CGroups like *BSD for instance.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/util/vircgroup.c

@@ -4882,9 +4882,9 @@ virCgroupGetFreezerState(virCgroupPtr group ATTRIBUTE_UNUSED,
 
 
 int
-virCgroupIsolateMount(virCgroupPtr group ATTRIBUTE_UNUSED,
-                      const char *oldroot ATTRIBUTE_UNUSED,
-                      const char *mountopts ATTRIBUTE_UNUSED)
+virCgroupBindMount(virCgroupPtr group ATTRIBUTE_UNUSED,
+                   const char *oldroot ATTRIBUTE_UNUSED,
+                   const char *mountopts ATTRIBUTE_UNUSED)
 {
     virReportSystemError(ENOSYS, "%s",
                          _("Control groups not supported on this platform"));