vulkan: Fix missing cmake logic for dot product extension

[jeffbolznv]

This is a missing interaction between #12135 and #12272

[0cc4m]

Thank you.

[bandoti]

I am seeing an emerging trend in the calls to execute_process to test-compile shaders. I don't expect it in this PR, but just noting that we should roll those checks into a macro/function to clean this up a bit and make it easier for adding new feature detection.

I am happy to make this change once I clean up some of my existing PRs 🙂

[jeffbolznv]

I am seeing an emerging trend in the calls to execute_process to test-compile shaders. I don't expect it in this PR, but just noting that we should roll those checks into a macro/function to clean this up a bit and make it easier for adding new feature detection.

I am happy to make this change once I clean up some of my existing PRs 🙂

This would be great. There will surely be more features in the future.

[bandoti]

Looks good to me.