[aquaria] Mostly-working 64-bit patch

[Peter De Wachter]

This patch builds upon Ryan's old patch and fixes a few more bugs.
With this patch Aquaria 64-bit seems playable. I've started a new game
and continued from a few old saved games and didn't encounter any
problems.

Things that still need to be fixed:
- The bundled GL.h is wrong for a 64-bit system. I've hacked the
makefile to include the system version instead.
- The game crashes when you quit, some kind of heap corruption.
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