More X11 (Xlib.h) avoidance ... this fixes roottest/root/html:
In file included from input_line_1411:1:
/local2/pcanal/cint_working/rootcling/root.untouched/include/Math/Derivator.h:224:8: error: cannot combine with previous 'int' declaration specifier
   int Status() const; 
       ^
/usr/include/X11/Xlib.h:90:16: note: expanded from macro 'Status'
#define Status int
               ^


git-svn-id: https://root.cern.ch/svn/root/trunk@48802 27541ba8-7e3a-0410-8455-c3a389f83636