enrolment plugins: MDL-21337 Missing global $OUTPUT variable in some enrolment plugins configuration page

enrol/database/enrol.php

@@ -434,7 +434,7 @@ function get_access_icons($course) {
 
 /// Overide the base config_form() function
 function config_form($frm) {
-    global $CFG;
+    global $CFG, $OUTPUT;
 
     $vars = array('enrol_dbhost', 'enrol_dbuser', 'enrol_dbpass',
                   'enrol_dbname', 'enrol_dbtable',

enrol/imsenterprise/enrol.php

@@ -97,7 +97,7 @@ function determine_default_rolemapping($imscode) {
 
 /// Override the base config_form() function
 function config_form($frm) {
-    global $CFG, $imsroles;
+    global $CFG, $OUTPUT, $imsroles;
 
     $vars = array('enrol_imsfilelocation', 'enrol_logtolocation', 'enrol_createnewusers', 'enrol_fixcaseusernames', 'enrol_fixcasepersonalnames', 'enrol_truncatecoursecodes',
             'enrol_createnewcourses', 'enrol_createnewcategories', 'enrol_createnewusers', 'enrol_mailadmins',

enrol/ldap/enrol.php

@@ -314,7 +314,7 @@ function get_access_icons($course) {
 
 /// Overrise the base config_form() function
 function config_form($frm) {
-    global $CFG;
+    global $CFG, $OUTPUT;
 
     $this->check_legacy_config();
 

enrol/manual/enrol.php

@@ -215,7 +215,7 @@ function check_group_entry ($courseid, $password) {
 * @param    frm  an object containing all the data for this page
 */
 function config_form($frm) {
-    global $CFG;
+    global $CFG, $OUTPUT;
 
     if (!isset( $frm->enrol_manual_keyholderrole )) {
         $frm->enrol_manual_keyholderrole = '';