inc: more pruning--reading manuals is good

`If a globalized variable is unset() inside of a function,
   only the local variable is destroyed. The variable in the
   calling environment will retain the same value as before
   unset() was called.'

via http://php.net/manual/en/function.unset.php

src/etc/inc/auth.inc

@@ -35,8 +35,8 @@
  * NOTE : Portions of the mschapv2 support was based on the BSD licensed CHAP.php
  * file courtesy of Michael Retterklieber.
  */
-if(!$do_not_include_config_gui_inc)
-	require_once("config.gui.inc");
+
+require_once("config.gui.inc");
 
 // Will be changed to false if security checks fail
 $security_passed = true;
@@ -44,7 +44,7 @@ $security_passed = true;
 /* If this function doesn't exist, we're being called from Captive Portal or
    another internal subsystem which does not include authgui.inc */
 if (function_exists("display_error_form") && !isset($config['system']['webgui']['nodnsrebindcheck'])) {
-	/* DNS ReBinding attack prevention.  https://redmine.pfsense.org/issues/708 */
+	/* DNS ReBinding attack prevention */
 	$found_host = false;
 
 	/* Either a IPv6 address with or without a alternate port */

src/etc/inc/config.lib.inc

@@ -349,29 +349,6 @@ function make_config_revision_entry($desc = null, $override_user = null) {
 	return $revision;
 }
 
-
-function pfSense_clear_globals() {
-	global $config, $FilterIfList, $GatewaysList, $filterdns, $aliases, $aliastable;
-
-	if (isset($FilterIfList))
-		unset($FilterIfList);
-
-	if (isset($GatewaysList))
-		unset($GatewaysList);
-
-	/* Used for the hostname dns resolver */
-	if (isset($filterdns))
-		unset($filterdns);
-
-	/* Used for aliases and interface macros */
-	if (isset($aliases))
-		unset($aliases);
-	if (isset($aliastable))
-		unset($aliastable);
-
-	unset($config);
-}
-
 /**
  * backup config to google drive and return current file list (/ info)
  *
@@ -434,5 +411,3 @@ function backup_to_google_drive() {
 	// not configured / issue, return empty list
 	return array();
 }
-
-register_shutdown_function('pfSense_clear_globals');