Merge changes Idf479bed,Iee7d56c1,I23d7945e,Ibd6fa875,I52f7afb4, ...
* changes:
vulkan: Add apk_library_dir virtual branch
Add support for loading layers from the apk.
Add default callbacks in the loader.
Add support for arbitrary number of layers
Add support for autoloading callback extension.
Add support for multiple layers in the same so
Add layer loading to android vulkan loader.
Fix GetSpecific*ProcAddr.
vulkan: Implement vk_ext_khr_*swapchain extensions
vulkan: Add skeleton swapchain support
vulkan: add copyright notices
vknulldrv: Implement VkImage
vulkan: warn on bogus CreateBuffer args