[dovecot/core] f6f50f: master: Removed hardcoded listen() backlog limit.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: f6f50f528f6dce764065780bf88ee1acb2422b0a
      https://github.com/dovecot/core/commit/f6f50f528f6dce764065780bf88ee1acb2422b0a
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2016-09-27 (Tue, 27 Sep 2016)

  Changed paths:
    M src/master/service-listen.c

  Log Message:
  -----------
  master: Removed hardcoded listen() backlog limit.

If it's already too large, the kernel will truncate it automatically. So
there shouldn't be any reason for us to explicitly limit it.