[aquaria] Patch to set data directory prefix at compile time

[James Le Cuirot]

Hi guys,

I've modified my data directory patch so that it can be committed
upstream. You now specify the prefix at compile time with a flag, for
example, -DBBGE_DATA_PREFIX="/usr/share/games". You can still override
this with the AQUARIA_DATA_PATH environment variable and it still falls
back to using the executable's directory on failure.

The layers of macros may seem odd but it seems you need that many to
stringify it properly. Please correct it if you know a better way.

James
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