magpie, simplepie: add (experimental) patches for broken libxml

magpierss/rss_parse.inc

@@ -160,6 +160,10 @@ class MagpieRSS {
                         
         xml_set_character_data_handler( $this->parser, 'feed_cdata' ); 
 
+	$source=str_replace("<","<",$source);
+	$source=str_replace(">",">",$source);
+	$source=str_replace("&","&",$source);
+    
         $status = xml_parse( $this->parser, $source );
 
 		  # try to force convert everything to UTF-8 and parse again

simplepie/simplepie.inc

@@ -12761,6 +12761,10 @@ class SimplePie_Parser
 		xml_set_character_data_handler($xml, 'cdata');
 		xml_set_element_handler($xml, 'tag_open', 'tag_close');
 
+		$data=str_replace("<","<",$data);
+		$data=str_replace(">",">",$data);
+		$data=str_replace("&","&",$data);
+
 		// Parse!
 		if (!xml_parse($xml, $data, true))
 		{