[AD] _add_exit_func patch

[Peter Wang <tjaden@xxxxxxxxxx>]

This patch makes _add_exit_func() take an additional argument, which is 
a descriptive string.  It helps to track down problems in allegro_exit() 
because then you can easily print out the string just before the 
offending hook function is run.  Usually you would try to use a debugger 
to find out which function is being run, but sometimes the debugger 
doesn't work (like what just happened to me).

Peter

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