option name collision with builtin 'include' special directive

Hi there,

Since version 2.19, it is possible to include other files (i.e., other c=
onfiguration files) in a configuration file, by using the include syntax=
:

     include "filename"

http://www.gnu.org/software/gengetopt/gengetopt.html#Configuration-files

Actually, we've run into the issue that our product has an option with s=
ame name: "include".

My concerns are:
- gengetopt runs fine without prompting there could be a potential probl=
em.
- gengetopt has no option to disable this feature or rename the builtin =
directive.
  Ot at least I can't see, in this case please point it out to me.

Unfortunately, we are in crazy hurry to publish the version of our produ=
ct and we must keep backward compatibility, too. So changing the applica=
tion is not option this time again.