rename octave::build_env namespace from octave::config * build-env-features.sh: Rename from ocgt-conf-features.sh. Update for new names. * build-env.h: Rename from oct-conf.h. Also declare features function. * build-env.in.cc: Rename from oct-conf.in.cc. * oct-conf-features.h: Delete. * libinterp/module.mk: Update. * toplev.cc, __init_gnuplot__.cc, octave.cc: Update for new names.

# recursive_nest.m
function x = recursive_nest ()
  global recursive_nest_inc = 1
  x = 5;
  f (20);

  function f (n)
    if n > 0
      x = x + recursive_nest_inc;
      f (n - 1);
    end
  endfunction
endfunction