tests: cover the winlib backend image rotation#157
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Adds an image rotation test for the win32 GDI graphics backend. A four-colour image drawn through -drawInRect: under a 90 degree rotation about the centre lands with the colours rotated a quarter turn, which exercises the WIN32GState -DPSimage: PlgBlt path with a rotating CTM. It builds only for the winlib graphics backend and skips when the backend cannot be reached, so it is inert on the other backends and in CI.
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Adds an image rotation test for the win32 GDI graphics backend.
A four-colour image drawn through -drawInRect: under a 90 degree rotation about
the centre lands with the colours rotated a quarter turn, which exercises the
WIN32GState -DPSimage: PlgBlt path with a rotating CTM.
It builds only for the winlib graphics backend and skips when the backend cannot
be reached, so it is inert on the other backends and in CI.