vulkan-zig-generated: remove custom patches

[emidoots]

vulkan-zig-generated applies these custom patches which is very nasty:

https://github.com/hexops/vulkan-zig-generated/blob/1d6c7a998dbaf268db005f8ab779ed23b30bbd68/generate.sh#L4-L12

see hexops/vulkan-zig-generated#2 (comment)

-- we should remove the need for this