vulkan : make the vulkan.hpp dynamic dispatcher instance private

[Acly]

• don't use VULKAN_HPP_DEFAULT_DISPATCH_LOADER_DYNAMIC_STORAGE which can cause conflicts if application or other libraries do the same
• sync : llama.cpp ggml#1344 (comment)
• vulkan: initialize vulkan-hpp to allow using extension function pointers #15705 (comment)

[jeffbolznv]

LGTM. CC @mtavenrath who I had discussed this with, in case he wants to propose a change to vulkan-hpp to make this simpler in the future.

[talregev]

Thank you! can you also duplicate your changes to ggml repo?
vcpkg take the changes from there.

[jeffbolznv]

llama.cpp changes get synced to ggml every week or so.

[talregev]

llama.cpp changes get synced to ggml every week or so.

Thanks! Why it not the way around?

[jeffbolznv]

It gets synced in both directions, it just happens that most of the development occurs in this repo.

[dg0yt]

This change solves the linking issue originally observed in vcpkg integration tests (ggml-org/ggml#1344 (comment)).

[0cc4m]

LGTM

[dg0yt]

Thank!