Update drm to 0.11

Drm-rs now no longer requires separate generated bindings for each
platform, so this fixes the build on architectures/OSes where drm didn't
have bindings.

It also now uses Rustix instead of Nix, but Nix is still used by the
Wayland and X11 backends, until the next wayland-rs and x11rb release.

This is not a breaking change since `drm` isn't exposed in the API.

src/kms.rs

@@ -340,8 +340,7 @@ impl<D: ?Sized, W: ?Sized> BufferImpl<'_, D, W> {
         // returns `ENOSYS` and check that before allocating the above and running this.
         match self.display.dirty_framebuffer(self.front_fb, &rectangles) {
             Ok(()) => {}
-            Err(drm::SystemError::Unknown { errno })
-                if errno as i32 == rustix::io::Errno::NOSYS.raw_os_error() => {}
+            Err(e) if e.raw_os_error() == Some(rustix::io::Errno::NOSYS.raw_os_error()) => {}
             Err(e) => {
                 return Err(SoftBufferError::PlatformError(
                     Some("failed to dirty framebuffer".into()),