Make cmdutils.c:parse_options accept as argument a function to parse

bare command line parameters.
patch by Stefano Sabatini, stefano.sabatini-lala poste it

Originally committed as revision 10112 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffplay.c

@@ -2530,7 +2530,7 @@ int main(int argc, char **argv)
     /* register all codecs, demux and protocols */
     av_register_all();
 
-    parse_options(argc, argv, options);
+    parse_options(argc, argv, options, parse_arg_file);
 
     if (!input_filename) {
         show_help();