moon-buggy sound add-on, version 1.0.51

This is a quick hack to add esd-based sound support to moon-buggy.  It
can only be used in conjunction with moon-buggy version 1.0.51.  As
moon-buggy should be able to run on a VT100 terminal, this add-on is
not part of the main moon-buggy distribution.

What it does:
* It adds three sound files to moon-buggy.  Because I own no microphone,
  these are stolen from the gnome-audio packet.
* It uses the libesd library to play these sounds at appropriate times.

What you need:
* the esound libraries and the esd daemon running
* the moon-buggy sources "moon-buggy-1.0.51.tar.gz"
* the moon-buggy sound add-on "moon-buggy-sound-1.0.51.tar.gz"


INSTALLATION:

1. Unpack the moon-buggy sources.
    tar xfvvz moon-buggy-1.0.51.tar.gz
2. Unpack the add-on.  This adds some files to the "moon-buggy-1.0.51/"
  directory.
    tar xfvvz moon-buggy-sound-1.0.51.tar.gz
3. Now enter the directory and apply the included patch
    cd moon-buggy-1.0.51/
    patch -p1 <sound.patch
4. Proceed with the usual moon-buggy installation
    ./configure <options>
    make
    make install