This commit changes the definitions for `window` in `XlibSurfaceCreateInfoKHR`
and `XcbSurfaceCreateInfoKHR` with to `u64` (xlib) and `u32` (xcb) (see
definitions below).
`vk-sys` defined `XlibSurfaceCreateInfoKHR` and `XcbSurfaceCreateInfoKHR` with
`pub window: *const c_void`. This propagates through to the API in
`vulkano::swapchain::Surface::from_{xlib,xcb}()`. As the native window types
in xcb/xlib are defined as unsigned ints, this may lead to the belief that a
pointer to such an integer is required. `vulkano` will create a `Surface` but
this surface will not be supported by any queue family.
xlib: https://cgit.freedesktop.org/xorg/proto/x11proto/tree/X.h#n96 and
https://cgit.freedesktop.org/xorg/proto/x11proto/tree/X.h#n66
(search `Windows`)
xcb: https://xcb.freedesktop.org/manual/group__XCB____API.html
(search `xcb_window_t`)
