wayland feature assumes one is using glfw-sys

[EriKWDev]

Hi!

I'm using debian with libglfw3-wayland installed, meaning my glfw uses wayland.

When I use this crate with default-features=false since I don't want the glfw-sys crate to compile and then try to enable the feature "wayland" in order for raw_window_handle to return the correct handle, suddenly glfw-sys is included again.

This leads to a linking error for me at least when the raw-window-handle feature is also enabled since it branches depending on wether the wayland feature was enabled:

ld.lld: error: undefined symbol: glfwGetX11Window

and since my glfw version doesn't seem to have x11 this happens :/

I propose that wayland should not enable glfw-sys by default, and only if glfw-sys is also enabled, or for those things to be separated