As an interim measure until a more permanent solution is implemented

As an interim measure until a more permanent solution is implemented
workaround the following error:

/usr/src/contrib/elftoolchain/strings/strings.c:198:55: error: use of
undeclared identifier
'FA_OPEN' fa = fileargs_init(argc, argv, O_RDONLY, 0, &rights, FA_OPEN);

Reported by:	O. Hartmann <ohartmann@walstatt.org>
Reported by:	Michael Butler <imb@protected-networks.net>
Reported by:	gjb@ & cy@ (implicit)
Reviewed by:	emaste@
Noted by:	rgrimes@