[dovecot/core] a70d86: config: Do not run ssl_dh check always

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: a70d867d1fe3584149811c65eb6213deb72be824
      https://github.com/dovecot/core/commit/a70d867d1fe3584149811c65eb6213deb72be824
  Author: Aki Tuomi <aki.tuomi at dovecot.fi>
  Date:   2017-11-02 (Thu, 02 Nov 2017)

  Changed paths:
    M src/config/config-request.c

  Log Message:
  -----------
  config: Do not run ssl_dh check always

Do it only when CONFIG_DUMP_FLAG_CHECK_SETTINGS is set. Fixes

"Warning: You can generate it with: dd if=ssl-parameters.dat bs=1 skip=88..."