move include statements for OpenGL headers to a single file * oct-opengl.h: New file. * libinterp/corefcn/module.mk: Update. * Canvas.cc, gl-select.cc, gl-select.h, gl-render.cc, gl-render.h, gl2ps-renderer.cc, __init_fltk__.cc, __osmesa_print__.cc: Update include statements.

#!/bin/sh
#
# Like mv $1 $2, but if the files are the same, just delete $1.
# Status is 0 if $2 is changed, 1 otherwise.

if test -r $2; then
  if cmp $1 $2 > /dev/null; then
    echo $2 is unchanged 1>&2
    rm -f $1
  else
    mv -f $1 $2
  fi
else
  mv -f $1 $2
fi