Refactor interrupt queue.
Remove non-existent function prototypes.
Remove commented code.
Implement add_interupt_event in term of add_interupt_event_count.
init special directly.
Add hack-fix for Perfect Dark freezes.

See
http://code.google.com/p/mupen64plus/issues/detail?id=553
mupen64plus-ae/mupen64plus-ae@802d8f8
Increase POOL capacity to 16 elements.
Merge pull request #38 from bsmiles32/interupt_refac

Refactor interupt.c