make gl2ps_renderer implementation private * gl2ps-print.h: Rename from gl2ps-renderer.h. * gl2ps-print.cc: Rename from gl2ps-renderer.cc. * libinterp/corefcn/module.mk: Update. * Canvas.cc, __init_fltk__.cc, __osmesa_print__.cc: Update.

%!function r = f (x)
%!  if (ischar (x))
%!    r = x;
%!  else
%!    error ("expecting character string");
%!  endif
%!endfunction

%!assert (eval ("f 10;"), "10");