Enabling MP3 support in vlc

[Jean-Paul Saman]

Now libmad is supported by vlc I would like to enable MP3 support. From
documentation I get that in src/input/input_program.c (function
input_SelectES) should be extended to support the new file type. I
suspect that vlc also has to be taught that a certain file is a MP3
file. Which files are responsible for file format recogniztion?

Greetings,
Jean-Paul Saman.