Add wayland-dlopen feature, like winit

Author: ids1024

Cargo.toml

@@ -12,8 +12,9 @@ categories = ["game-development", "graphics", "gui", "multimedia", "rendering"]
 exclude = ["examples"]
 
 [features]
-default = ["x11", "wayland"]
+default = ["x11", "wayland", "wayland-dlopen"]
 wayland = ["wayland-backend", "wayland-client", "nix"]
+wayland-dlopen = ["wayland-sys/dlopen"]
 x11 = ["x11-dl"]
 
 [dependencies]
@@ -24,6 +25,7 @@ raw-window-handle = "0.5.0"
 nix = { version = "0.26.1", optional = true }
 wayland-backend = { version = "0.1.0-beta.14", features = ["client_system"], optional = true }
 wayland-client = { version = "0.30.0-beta.14", optional = true }
+wayland-sys = "0.30.0"
 x11-dl = { version  = "2.19.1", optional = true }
 
 [target.'cfg(target_os = "windows")'.dependencies.windows-sys]