ffmpeg: 10l add back show_banner() that was lost in the last merge.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

avconv.c

@@ -4358,6 +4358,7 @@ int main(int argc, char **argv)
     av_register_all();
     avformat_network_init();
 
+    show_banner();
 
     /* parse options */
     parse_options(&o, argc, argv, options, opt_output_file);

ffmpeg.c

@@ -4732,6 +4732,7 @@ int main(int argc, char **argv)
     av_register_all();
     avformat_network_init();
 
+    show_banner();
 
     term_init();