Add some missing headers. It is not really ok to include Xutil.h
without first including Xlib.h.


git-svn-id: https://tigervnc.svn.sourceforge.net/svnroot/tigervnc@5078 3789f03b-4d11-0410-bbf8-ca57d06f2519
Add support for older Xorg releases.


git-svn-id: https://tigervnc.svn.sourceforge.net/svnroot/tigervnc@5079 3789f03b-4d11-0410-bbf8-ca57d06f2519