Implement X11 extensions using x11rb instead of Xlib

Removes Xlib code by replacing it with the x11rb equivalent,
the commit handles xrandr, xinput, xinput2, and xkb.

Signed-off-by: John Nunley <dev@notgull.net>

src/platform_impl/linux/x11/ffi.rs

@@ -1,7 +1,6 @@
 use x11_dl::xmd::CARD32;
 pub use x11_dl::{
     error::OpenError, keysym::*, xcursor::*, xinput::*, xinput2::*, xlib::*, xlib_xcb::*,
-    xrandr::*, xrender::*,
 };
 
 // Isn't defined by x11_dl