The comp_window_peek needs sdl2 with Vulkan supporting, and normal sdl2 installation doesn't support Vulkan. So we need to install Vulkan feature of sdl2 explicitly to let sdl2 work with Vulkan, and let comp_window_peek works on Windows.
It will tell vcpkg to copy sdl2 library to the build directory. Signed-off-by: utzcoz <utzcoz@outlook.com>