core: Some fixes for the new option/argument parser
* src/argparse.c (ARGPARSE_FLAG__INITIALIZED): New. (initialize): Use a flag bit to track the initialization state. (_gpgrt_argparser): Clear some state on switching files.
- Fixes-commit: 933eb9346a84c87f83f77d990be2f66e2f7b62e7
- Signed-off-by: Werner Koch <wk@gnupg.org>