[AD] OSX - Cmd-Q Exit is really a crash

[Peter Hull <peter.hull90@xxxxxxxxxx>]

In Christer's little program (the one that hangs Linux), there's no way 
to exit apart from pressing cmd-Q. I noticed that this doesn't exit 
cleanly, it actually crashes the program, in fullscreen mode. The 
attached patch improves matters, in that the program will always pass 
through allegro_exit(), but it is still rather ugly.

The reason is that the user's program runs in thread #2, but the signal 
is caught in thread #1. Usually thread #1 terminates the program before 
#2 has time to do anything else but sometimes it doesn't, and thread #2 
finds that the rug has been pulled from under its feet, so to speak.

Therefore the current solution has the desired effect (terminating the 
program) but is not very elegant.

Any signals experts out there can help?

Pete

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