[Minor] remove the unused private variables

src/Composer/Repository/ComposerRepository.php

@@ -53,8 +53,6 @@ class ComposerRepository extends ArrayRepository
     protected $eventDispatcher;
     protected $sourceMirrors;
     protected $distMirrors;
-    private $rawData;
-    private $minimalPackages;
     private $degradedMode = false;
     private $rootData;
 

src/Composer/Util/RemoteFilesystem.php

@@ -26,7 +26,6 @@ class RemoteFilesystem
 {
     private $io;
     private $config;
-    private $firstCall;
     private $bytesMax;
     private $originUrl;
     private $fileUrl;