Simplify show_banner() so that it does not require arguments, similar

to what was previously done with show_version().
patch by Stefano Sabatini, stefano.sabatini-lala poste it

Originally committed as revision 13526 to svn://svn.ffmpeg.org/ffmpeg/trunk

cmdutils.c

@@ -196,7 +196,7 @@ void print_error(const char *filename, int err)
     }
 }
 
-void show_banner(const char *program_name, int program_birth_year)
+void show_banner(void)
 {
     fprintf(stderr, "%s version " FFMPEG_VERSION ", Copyright (c) %d-2008 Fabrice Bellard, et al.\n",
             program_name, program_birth_year);