[Bug 729621] Common X11 check only looks for X11/Xlib.h, not for libX11

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=729621
  GStreamer | common | unspecified

--- Comment #5 from Luis de Bethencourt <luis at debethencourt.com> 2014-05-06 15:14:05 UTC ---
It works here, and I have reworded the commits in my local branches.

Anybody wants to join the review before I push?

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