Update FreeImage to 3.17.0

[Ident]

Original report by Luca Ebach (Bitbucket: lucebac, GitHub: lucebac).

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Update FreeImage to 3.17.0 as that release contains an updated version of OpenEXR that previously failed to build if using MSVC13

[Ident]

Original comment by Lukas Meindl (Bitbucket: Ident8, ).

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Needs to target default branch