uterm: remove libudev.h includes if not needed

All udev-dependencies are now moved into uterm-monitor. This allows us to
easily make udev optional for hotplug-less systems or emergency setups.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

src/uterm_video.c

@@ -31,7 +31,6 @@
 
 #include <errno.h>
 #include <inttypes.h>
-#include <libudev.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>

src/uterm_video_drm.c

@@ -38,7 +38,6 @@
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <inttypes.h>
-#include <libudev.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>

src/uterm_video_fbdev.c

@@ -29,7 +29,6 @@
 
 #include <errno.h>
 #include <fcntl.h>
-#include <libudev.h>
 #include <linux/fb.h>
 #include <stdbool.h>
 #include <stdlib.h>