gpg: Fallback to import with self-sigs-only on too large keyblocks.
* g10/import.c (import_one): Rename to ... (import_one_real): this. Do not print and update stats on keyring write errors. (import_one): New. Add fallback code.
- GnuPG-bug-id: T4591
- Signed-off-by: Werner Koch <wk@gnupg.org>