Fix PHP deprecation warnings

lib/BDAParser.php

@@ -14,6 +14,14 @@ class BDAParser
 {
     const RFC_822 = 'D, d M Y H:i:s T';
 
+    private $show_dir;
+    private $archive_url;
+    private $mp3_bitrate;
+    private $cachefile;
+    private $len_cache;
+    private $cache_dirty = true;
+    private $meta_cache;
+
     public function __construct($show_dir, $archive_url, $mp3_bitrate = 128)
     {
         $this->show_dir = $show_dir;

lib/RSSGenerator.php

@@ -19,6 +19,13 @@ class RSSGenerator
         'dcterms' => 'https://purl.org/dc/terms',   // for validity periods
     ];
 
+    private $self_url;
+    private $show_url;
+    private $items;
+    private $global_conf;
+    private $show_conf;
+    private $show_intro;
+
     public function __construct($feed_url, $show_url)
     {
         $this->self_url = $feed_url;