scripts: Remove vk-generate.py
scripts: Remove vk-generate.py

No longer used for def-file or dispatch-table-helper generation.

Change-Id: I3864441e900ecb3ebc2e9fdf5cb4dfc785b2ad83

KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers,KhronosGroup/Vulkan-LoaderAndValidationLayers