Remove xlib_xconnection from public interface

src/platform_impl/linux/mod.rs

@@ -116,7 +116,7 @@ impl Default for PlatformSpecificWindowBuilderAttributes {
 }
 
 #[cfg(x11_platform)]
-pub static X11_BACKEND: Lazy<Mutex<Result<Arc<XConnection>, XNotSupported>>> =
+pub(crate) static X11_BACKEND: Lazy<Mutex<Result<Arc<XConnection>, XNotSupported>>> =
     Lazy::new(|| Mutex::new(XConnection::new(Some(x_error_callback)).map(Arc::new)));
 
 #[derive(Debug, Clone)]
@@ -142,7 +142,7 @@ impl fmt::Display for OsError {
     }
 }
 
-pub enum Window {
+pub(crate) enum Window {
     #[cfg(x11_platform)]
     X(x11::Window),
     #[cfg(wayland_platform)]