libobs-d3d11: Relax minimum Windows for flip model

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We'll need flip model swap chains in the future for HDR, and we don't
want to limit HDR to WIndows 11. The new test is the existence of
IDXGIFactory5, which was introduced in Windows 10 1607. This should be
enough for HDR, for which we use APIs in Windows 10 1703.

Hopefully having SetMaximumFrameLatency(40) this time will make enough
of a difference to not bring back reports of degraded performance when
using flip model on Windows 10.

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