[TASK] Remove constant PATH_t3lib

The directory is gone, so the constant is not needed anymore.

Resolves: #49348
Relates: #49342
Releases: 6.2
Change-Id: I0ecec0dfd985b534e3357b175d6dd1e00cc0e4bd
Reviewed-on: https://review.typo3.org/21599
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn

typo3/sysext/core/Classes/Core/SystemEnvironmentBuilder.php

@@ -161,9 +161,6 @@ class SystemEnvironmentBuilder {
 		// Example "install/" for the install tool entry script
 		// Example "../typo3conf/ext/templavoila/mod2/ for an extension installed in typo3conf/ext/
 		define('PATH_typo3_mod', defined('TYPO3_MOD_PATH') ? TYPO3_MOD_PATH : '');
-		// Absolute path to the t3lib directory with trailing slash
-		// Example "/var/www/instance-name/htdocs/t3lib/"
-		define('PATH_t3lib', PATH_site . 't3lib/');
 		// Absolute path to the typo3conf directory with trailing slash
 		// Example "/var/www/instance-name/htdocs/typo3conf/"
 		define('PATH_typo3conf', PATH_site . 'typo3conf/');

typo3/sysext/t3editor/Classes/ts_codecompletion/class.tx_t3editor_codecompletion.php

@@ -24,7 +24,6 @@
  *
  *  This copyright notice MUST APPEAR in all copies of the script!
  ***************************************************************/
-require_once PATH_t3lib . 'class.t3lib_page.php';
 $GLOBALS['LANG']->includeLLFile('EXT:t3editor/locallang.xml');
 /*
  * @deprecated since 6.0, the classname tx_t3editor_codecompletion and this file is obsolete