Update PHP-Parser for 7.1 compatibility

Signed-off-by: Joas Schilling <coding@schilljs.com>
Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

3rdparty

-Subproject commit 2fac6fcf993f9cff25845218c3dccf3617ae14a7
+Subproject commit 42b675142d5c33b585f1bb204e910afeed7e98db

build/OCPSinceChecker.php

 echo 'Parsing all files in lib/public for the presence of @since or @deprecated on each method...' . PHP_EOL . PHP_EOL;
 
 
-$parser = new PhpParser\Parser(new PhpParser\Lexer);
+$parser = (new PhpParser\ParserFactory)->create(PhpParser\ParserFactory::PREFER_PHP7);
 
 /* iterate over all .php files in lib/public */
 $Directory = new RecursiveDirectoryIterator(dirname(__DIR__) . '/lib/public');

lib/private/App/CodeChecker/CodeChecker.php

 namespace OC\App\CodeChecker;
 
 use OC\Hooks\BasicEmitter;
-use PhpParser\Lexer;
 use PhpParser\NodeTraverser;
 use PhpParser\Parser;
+use PhpParser\ParserFactory;
 use RecursiveCallbackFilterIterator;
 use RecursiveDirectoryIterator;
 use RecursiveIteratorIterator;
 	public function __construct(ICheck $checkList, $checkMigrationSchema) {
 		$this->checkList = $checkList;
 		$this->checkMigrationSchema = $checkMigrationSchema;
-		$this->parser = new Parser(new Lexer);
+		$this->parser = (new ParserFactory)->create(ParserFactory::PREFER_PHP7);
 	}
 
 	/**