Fix dependency for Imlib2

Bug-Gentoo: https://bugs.gentoo.org/605930
Origin: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=97d6e3e6839898829e8cce211b97a7fa77f5d06e

w3mimg/fb/fb_imlib2.c

@@ -3,7 +3,6 @@
                 fb_imlib2.c 0.3 Copyright (C) 2002, hito
  **************************************************************************/
 
-#include <X11/Xlib.h>
 #include <Imlib2.h>
 #include "fb.h"
 #include "fb_img.h"