[ticket/15536] Catalog: adds satis.phpbb.com to repositories

Also always installs composer/installers in vendor-ext too.

PHPBB3-15536

phpBB/phpbb/composer/installer.php

@@ -471,13 +471,18 @@ class installer
 		$composer = Factory::create($io, null, false);
 
 		$core_packages = $this->get_core_packages($composer);
+
+		// The composer/installers package must be installed on his own and not provided by the existing autoloader
+		$core_replace = $core_packages;
+		unset($core_replace['composer/installers']);
+
 		$ext_json_data = [
 			'require' => array_merge(
 				['php' => $this->get_core_php_requirement($composer)],
 				$core_packages,
 				$this->get_extra_dependencies(),
 				$packages),
-			'replace' => $core_packages,
+			'replace' => $core_replace,
 			'repositories' => $this->get_composer_repositories(),
 			'config' => [
 				'vendor-dir'=> $this->packages_vendor_dir,