* src/argparse.c (_gpgrt_argparse_internal_s): Add fields no_registry
and registry.
(initialize): Init them.
(emulated_registry_lookup): New.
(handle_meta_getenv): Use it.
* tests/etc/t-argparse.conf: Add a getreg meta command.
* tests/t-argparse.c (opt): Add a disable-akr command.
* tests/etc/Registry: New.