[FFmpeg-devel] [PATCH 2/2] hwcontext_vulkan: expose enabled device and instance extensions

[Lynne]

This solves a huge oversight - it lets users reliably use their own 
AVVulkanDeviceContext. Otherwise, the extensions supplied and enabled
are not discoverable by anything outside of hwcontext_vulkan.

Patch attached.

This, and the previous patch to enable extensions through the options are really needed
to make the hwcontext useful and interoperable with other Vulkan API users, so I'm planning
to push them later tonight.

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