Move x11idle.c from utils/ to contrib/scripts/

contrib/README

@@ -91,6 +91,7 @@ org2hpda             --- Generate hipster pda style printouts from Org-mode
 org-docco.org        --- docco side-by-side annotated code export to HTML
 StartOzServer.oz     --- implements the Oz-side of the Org-babel Oz interface
 staticmathjax        --- XULRunner application to process MathJax statically
+x11idle.c            --- get the idle time of your X session
 
 This directory also contains supporting files for the following
 packages: ob-oz.el, org-docco.org, and org-static-mathjax.el.