add windir and systemroot

Author: swissspidy

src/Context/FeatureContext.php

@@ -464,7 +464,7 @@ private static function get_process_env_variables(): array {
 
 		$env = array_merge( $_ENV, $env );
 
-		foreach ( [ 'TEMP', 'TMP' ] as $key ) {
+		foreach ( [ 'TEMP', 'TMP', 'SystemRoot', 'windir' ] as $key ) {
 			$value = getenv( $key );
 			if ( false !== $value ) {
 				$env[ $key ] = $value;