gpg: Minor clean up for keydb_lock API.
* g10/keydb-private.h (internal_keydb_lock): Remove. * g10/keydb.c (internal_keydb_lock): It's internal function. * g10/call-keyboxd.c (keydb_lock): Move to... * g10/keydb.c (keydb_lock): ... here.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>