asx.c: user ProcessMRL for playlist href to be able to use relative paths in playlist-file

This and earlier change to add access to prefix should fix usage of eg
http://media.meteo.it/vsat.asx playlist-file.

modules/demux/playlist/asx.c

@@ -531,9 +531,11 @@ static int Demux( demux_t *p_demux )
                     char *psz_current_input_name = input_item_GetName( p_current_input );
                     if( asprintf( &psz_name, "%d %s", i_entry_count, ( psz_title_entry ? psz_title_entry : psz_current_input_name ) ) != -1 )
                     {
-                        p_entry = input_item_NewExt( p_demux, psz_href, psz_name,
+                        const char *psz_mrl = ProcessMRL( psz_href, p_demux->p_sys->psz_prefix );
+                        p_entry = input_item_NewExt( p_demux, psz_mrl, psz_name,
                                                      i_options, (const char * const *)ppsz_options, VLC_INPUT_OPTION_TRUSTED, -1 );
                         free( psz_name );
+                        free( psz_mrl );
                         input_item_CopyOptions( p_current_input, p_entry );
                         while( i_options )
                         {
@@ -613,8 +615,10 @@ static int Demux( demux_t *p_demux )
                                 input_item_t *p_entry = NULL;
                                 char *psz_name = input_item_GetName( p_current_input );
 
-                                p_entry = input_item_NewExt( p_demux, psz_href, psz_name,
+                                const char *psz_mrl = ProcessMRL( psz_href, p_demux->p_sys->psz_prefix );
+                                p_entry = input_item_NewExt( p_demux, psz_mrl, psz_name,
                                                      0, NULL, VLC_INPUT_OPTION_TRUSTED, -1 );
+                                free( psz_mrl );
                                 input_item_CopyOptions( p_current_input, p_entry );
                                 if( psz_title_entry ) input_item_SetTitle( p_entry, psz_title_entry );
                                 if( psz_artist_entry ) input_item_SetArtist( p_entry, psz_artist_entry );