Add entity encoding for input options when outputting an xml file.

Entity encoding was missing (for options) in generation of an xspf playlist.
On the reading side the entity decoding is all fine.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
(cherry picked from commit 21f056e8c51e0c1f9ad522a41b5cfd48ea088160)

modules/misc/playlist/xspf.c

@@ -208,10 +208,18 @@ xspfexportitem_end:
 
     for( int i = 0; i < p_item->p_input->i_options; i++ )
     {
-        fprintf( p_file, "\t\t\t\t<vlc:option>%s</vlc:option>\n",
-                 p_item->p_input->ppsz_options[i][0] == ':' ?
-                 p_item->p_input->ppsz_options[i] + 1 :
-                 p_item->p_input->ppsz_options[i] );
+        char* psz_src = p_item->p_input->ppsz_options[i];
+        char* psz_ret = NULL;
+
+        if ( psz_src[0] == ':' )
+            psz_src++;
+
+        psz_ret = convert_xml_special_chars( psz_src );
+        if ( psz_ret == NULL )
+            continue;
+
+        fprintf( p_file, "\t\t\t\t<vlc:option>%s</vlc:option>\n", psz_ret );
+        free( psz_ret );
     }
     fputs( "\t\t\t</extension>\n", p_file );
     fputs( "\t\t</track>\n", p_file );