common,w32: Always use share mode readwrite for the keybox.
* common/iobuf.c (direct_open) [W32]: Always use a share mode read or write. * kbx/keybox-init.c (_keybox_ll_open): Ditto. This requires the latest gpgrt to work.
Cherry pick 2.2 commit:
3971b2528f465dcac0ea75c77840cb22b6a969d3
This change might help with
- GnuPG-bug-id: T7829