Add clone to the extensions

src/extensions/android_surface.rs

@@ -7,6 +7,7 @@ use vk;
 use std::ffi::CStr;
 use ::RawPtr;
 
+#[derive(Clone)]
 pub struct AndroidSurface {
     handle: vk::Instance,
     android_surface_fn: vk::AndroidSurfaceFn,

src/extensions/debug_report.rs

@@ -6,6 +6,7 @@ use vk;
 use std::ffi::CStr;
 use ::RawPtr;
 
+#[derive(Clone)]
 pub struct DebugReport {
     handle: vk::Instance,
     debug_report_fn: vk::DebugReportFn,

src/extensions/mir_surface.rs

@@ -7,6 +7,7 @@ use vk;
 use std::ffi::CStr;
 use ::RawPtr;
 
+#[derive(Clone)]
 pub struct MirSurface {
     handle: vk::Instance,
     mir_surface_fn: vk::MirSurfaceFn,

src/extensions/surface.rs

@@ -8,6 +8,7 @@ use vk;
 use std::ffi::CStr;
 use ::RawPtr;
 
+#[derive(Clone)]
 pub struct Surface {
     handle: vk::Instance,
     surface_fn: vk::SurfaceFn,

src/extensions/swapchain.rs

@@ -7,6 +7,7 @@ use vk;
 use std::ffi::CStr;
 use ::RawPtr;
 
+#[derive(Clone)]
 pub struct Swapchain {
     handle: vk::Device,
     swapchain_fn: vk::SwapchainFn,

src/extensions/wayland_surface.rs

@@ -6,6 +6,7 @@ use vk;
 use std::ffi::CStr;
 use ::RawPtr;
 
+#[derive(Clone)]
 pub struct WaylandSurface {
     handle: vk::Instance,
     wayland_surface_fn: vk::WaylandSurfaceFn,

src/extensions/win32_surface.rs

@@ -7,6 +7,7 @@ use vk;
 use std::ffi::CStr;
 use ::RawPtr;
 
+#[derive(Clone)]
 pub struct Win32Surface {
     handle: vk::Instance,
     win32_surface_fn: vk::Win32SurfaceFn,

src/extensions/xcb_surface.rs

@@ -7,6 +7,7 @@ use vk;
 use std::ffi::CStr;
 use ::RawPtr;
 
+#[derive(Clone)]
 pub struct XcbSurface {
     handle: vk::Instance,
     xcb_surface_fn: vk::XcbSurfaceFn,