make check for current stable on ubuntu 16.04

[Tatsuro MATSUOKA]

I have built current stable source hd-id 00d42b86d0a5.

Summary:

  PASS                            14727
  FAIL                                1
  XFAIL (reported bug)               31
  XFAIL (expected failure)            5
  SKIP (missing feature)             39
  SKIP (run-time condition)          12

  scripts/plot/util/__opengl_info__.m ......................... PASS      2/3   
                                                                  FAIL    1
fntest.log

>>>>> processing 
>>>>> /home/mousei7/work/Octave/octave-hg-stable/octave/scripts/plot/util/__opengl_info__.m
***** testif HAVE_OPENGL, HAVE_FLTK; have_window_system () && any (strcmp 
("fltk", available_graphics_toolkits ()))
 old_toolkit = graphics_toolkit ();
 unwind_protect
   graphics_toolkit ("fltk");
   a = __opengl_info__ ();
 unwind_protect_cleanup
   graphics_toolkit (old_toolkit);
 end_unwind_protect
 assert (! isempty (a));
 assert (isfield (a, "version"));
!!!!! test failed
value on right hand side of assignment is undefined


Tatsuro