xwayland: Include <sys/type.h> where needed

With the addition of linux_dmabuf v4, the code adds dev_t in various
places but did not include <sys/types.h>.

While that works on glibc, it may fail to build on other libc
implementations such as musl libc.

Make sure to explicitly include <sys/types.h> where we use dev_t.

Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1445
Fixes: bddfe190de - Implement linux_dmabuf_feedback event handlers

hw/xwayland/xwayland-glamor.h

@@ -28,6 +28,8 @@
 
 #include <xwayland-config.h>
 
+#include <sys/types.h>
+
 #include <wayland-client.h>
 
 #include "xwayland-types.h"

hw/xwayland/xwayland-window.h

@@ -28,8 +28,11 @@
 
 #include <xwayland-config.h>
 
+#include <sys/types.h>
+
 #include <stdio.h>
 #include <unistd.h>
+
 #include <X11/X.h>
 #include <dix.h>
 #include <propertyst.h>