dirmngr: Return a proper error for all dead hosts.
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dirmngr: Return a proper error for all dead hosts.

* dirmngr/ks-engine-hkp.c (map_host): Change to return an gpg_error_t.
Return an error code for all dead hosts.
(make_host_part): Change to return an gpg_error_t.  Change all
callers.

The functions used to return an error code via ERRNO. However, this
does not allow to return extra error codes in a portable way. Thus we
change the function to directly return a gpg_error_t.