Randomise spawning apples in snake.el

[Stuart Hacking]

Hi,

This is my first quick modification to emacs.  I hope I've produced  
the .diff correctly, if not, please yell at me for not correctly  
reading the submission guidelines. (Also: I apologise if this is not  
the correct place to submit patches - I didn't see anything about code  
submission on savannah. Please advise if necessary.)

The modification changes snake.el so that new apples will be spawned  
at random locations rather than being deposited behind the snake.  I  
intended to govern the spawn rate based on score, however, since the  
game speed increases I decided this was unnecessary.

Hope this provides enjoyment for someone - now onto bigger and better  
things! :-)

Kindest Regards
Stuart

snake_rand_apples.el.diff
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