[dovecot/core] 220766: configure: Fix dcrypt build

[GitHub]

  Branch: refs/heads/master-2.2
  Home:   https://github.com/dovecot/core
  Commit: 22076652ab5ceec97652c473b58490c13d8796f2
      https://github.com/dovecot/core/commit/22076652ab5ceec97652c473b58490c13d8796f2
  Author: Aki Tuomi <aki.tuomi at dovecot.fi>
  Date:   2016-08-11 (Thu, 11 Aug 2016)

  Changed paths:
    M configure.ac
    M src/Makefile.am
    M src/lib-dcrypt/Makefile.am

  Log Message:
  -----------
  configure: Fix dcrypt build