scripts: Update loader automation
scripts: Update loader automation

Merge a few if's together to make the code easier to follow.

Change-Id: I2453c8217da81befb4f44af19241c13c4aaef8af

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