dirmngr: Add command option to mark hosts as dead or alive.
* dirmngr/server.c (cmd_killdirmngr): Factor some code out to ... (check_owner_permission): here. (cmd_keyserver): Add options --dead and --alive. * dirmngr/ks-engine-hkp.c (host_in_pool_p): New. (ks_hkp_mark_host): New.
Also removed the warning that the widnows part has not yet been done.
AFAICS, the current mingw supports the all used socket functions.