[PATCH xextproto] Death to Multibuffer extension

[Alan Coopersmith]

Isn't removing the headers from xextproto going to break the build of
libXext & older Xservers?

(No, you can't delete functions from libXext - we don't break client
 library ABI like that.   This is why we also no longer add new
 extensions to libXext, so we're not left with unused appendixes forever.)

-- 
	-Alan Coopersmith-        alan.coopersmith at oracle.com
	 Oracle Solaris Platform Engineering: X Window System