Properly disable exceptions on MSVC

[InfoTeddy]

Apparently the actual way to do this is to use -, not c.

Fixes #1117.

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• [x] My changes may be used in a future commercial release of VVVVVV
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[InfoTeddy]

Closing due to the fact that this doesn't actually work. See https://github.com/TerryCavanagh/VVVVVV/issues/1117#issuecomment-1904711381.