Introduce Predictive Flushing and Improve ASYNC GPU

vk_pipeline_cache: Fix unintentional memcpy into optional

The intention behind this was to assign a float to from an uint32_t, but
it was unintentionally being copied directly into the std::optional.

Copy to a temporary and assign that temporary to std::optional. This can
be replaced with std::bit_cast<float> once we are in C++20.

thread: FPCR.FZ is likely not 1 (and FPCR.RMode = TieAway and FPCR.DN = 0)

Set _FORTIFY_SOURCE=0 if building Opus with mingw-w64

Add missing ;

Introduce dummy context for yuzu-cmd VK support

 renderer_vulkan: Integrate Nvidia Nsight Aftermath on Windows