[aquaria] [patch] CMakeLists.txt fix for proper MinGW building

[GMMan]

Here's a patch that will make sure that Aquaria is built as a Windows
GUI app instead of a console app when using GCC (and possibly MSVC).
I find rewriting the same block into a if-else-endif redundant, but
that's the only way it could be done. Any more efficient methods?
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