[dovecot/core] 16c590: configure: Link libsmtp before libdns

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 16c59052a66d7fa559cfd49146b0783b3bb8262f
      https://github.com/dovecot/core/commit/16c59052a66d7fa559cfd49146b0783b3bb8262f
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2017-01-10 (Tue, 10 Jan 2017)

  Changed paths:
    M configure.ac

  Log Message:
  -----------
  configure: Link libsmtp before libdns

Fixes linking LIBDOVECOT when using .a libraries