ostream: Default seek&write_at implementations should fail with ESPIPE, not EPIPE.
ostream: Default seek&write_at implementations should fail with ESPIPE, not EPIPE.

LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot