Work around poorly configured php

src/Composer/Repository/ComposerRepository.php

@@ -70,7 +70,7 @@ class ComposerRepository extends ArrayRepository implements NotifiableRepository
             array(
                 'method'  => 'POST',
                 'header'  => 'Content-type: application/x-www-form-urlencoded',
-                'content' => http_build_query($params),
+                'content' => http_build_query($params, '', '&'),
                 'timeout' => 3,
             )
         );